Disclaimer: This could either be fan fiction or reality. It depends completely on the writers. And I want to believe it's the latter. The reason being the writers are professionals and it is their job. They can't be as dumb as butchering the ML's character in the show. And I also believe that the IV is a well-planned PR stunt considering how Gashmeer threw the writers under the bus and weirdly justified AKT deleting the video for the sake of the baby.
Okay, these are my thoughts on Adi's behavior these days after him watching the video. I've gathered them after reading some of your views and much thought.
The moment Adi watched the video, he said "koi insaan itna nahi badalsakta" meaning he accepted that she was like this all along. He also said "jhoot pe jhoot, jhoot pe jhoot bolti rahi, sirf tum sach lekiye ladrahi thi" and said to Imlie that he didn't give her his saath, and if he had believed her at the beginning itself, things wouldn't have come this far. He said he's ashamed
Now, considering Adi's character, when he feels ashamed of his behavior, he will not rest until he fixes things ruined by him. He was shattered after watching the video, he instantly believed everything Imlie said from day 1. And he confessed the same in front of the whole family that only Imlie was right from day one. Note that he did not only believe the claim that M drugged him and wore Imlie's saree but also everything that Imlie kept saying from the day he brought M home. Now he is ready to get Malini punished.
When Imlie told him that he can't lose this fight, he said "what is the use of winning it when I lost so much?" He didn't care about winning/losing the case. But Imlie wanted Malini to get punished, so he agreed. But after Malini said she's pregnant, he still argued with AC that he's watched the recording of whatever happened that night. But AC said she drugged Malini too. Did he buy it? How could he when Imlie is clear that Malini wasn't drugged based on the video? He sure is smarter than Imlie in discerning such circumstances. So we're still not sure.
Going by his own words, now we know that Adi knows Malini was wrong from day 1. He now knows for sure that Malini loves him. So it makes sense that he didn't question Malini about the previous incidents.
Now Adi's goal should be to get rid of that woman and throw her away from Imlie especially but in came the pregnancy. That put brakes on his decision to punish her. One thing to be noted is that he never argued after watching the video that it was AC, not MC that drugged them. He said he couldn't send her to jail. If he believed that AC did it, he would've said that MC is not the culprit. But he didn't. He only said AC is admitting to the crime and she can do anything to spoil our life(more like she's not going to let us win this case & a baby is involved here). So he only said that he did it for the kid. And he never spoke to Malini after that. It was only during Imlie's kidnap and her cravings day that he responded to her.
Coming back to the pregnancy claim. Did Adi buy it? There could be two things,
1. He did believe that Malini is pregnant(but we don't know if he thinks it was consensual or rape) and took full responsibility for the upcoming child.
2. He's doubtful about the claim but gave her the benefit of doubt and took responsibility for the baby.
Either way, he knows that he has to kick her out of their lives but the baby/the possibility is stopping him.
Adi was never about material things. He always wanted to give Imlie all that is her's and all that she deserves. This was shown during her birthday and also during her exam result day. He gave her no material gift but only the things she deserved. He was on this mission since truth revelation and he should continue to do the same now. So, his focus shifted to doing whatever he should for the baby and getting rid of Malini so that he can give Imlie all that she deserves.
But why is he entertaining Malini when he knows her intentions? He could've easily understood that she is involved in the kidnap and that she was misleading him about Imlie coming back from college. Why is he sitting at the dining table with her? The only explanation for this is that he probably understood the mental state of Malini and knows that she could harm the baby if she doesn't get what she wants. This is a serious concern for Adi. So, he had to entertain her, and hence the long drive. Also, he knew that Imlie can take care of herself. So, he wasn't concerned as much. But even then he wanted to know if she returned but he noticed Malini stopping him. He could've asked her to wait a minute but the way she stopped him was by acting as if she choked on something. Again, he probably knows her mental state and couldn't risk the baby here, so he didn't make the call. Even when Imlie returned, he asked her about the debate. This felt very fake to me. Why would he care about anything when his wife was almost kidnapped again? Again, the only way to make sense of this is that Malini was right there listening to their conversation. Any question asked by Adi would immediately expose Malini. He was not ready to do that hence the question of the debate. Also, he never took Imlie out on a date earlier except the chai date where he gifted her the sketch which was incidental. Though he always wanted to spend time with Imlie, he never asked her to go out with him on a date. This time, he did and also stressed that he wants no other person with them. He also told her the next day that he wants to talk to her about something and that's the reason this date was so important to him. He didn't say him wanting to spend time with her was the reason.
Even before that, why didn't he do anything about her college? Or did he? Did he ask KC to send a notice? How would KC know otherwise that Imlie is suspended? Imlie could've told him. But why did he not react much, not even get up from the table? He probably knew Malini was the reason for Imlie's suspension by then and didn't want to provoke her into doing something more dangerous to Imlie.
And today about the puja, he could've easily rejected AC's request and told Malini that he's sorry and is not interested in the puja as she already knows he's not into these rituals. But he stayed silent and looked at Imlie just like he did the other day letting her decide if Malini will stay here or not. Both times, he knows what Imlie's answer is going to be and that's the reason he let her decide.
In today's car scene, Adi was observing Malini while NN pushed her back. The guy who rarely looks at M was staring at her. And he was doing the same after she got it and then asked her about the reports. Why did he care to ask her who called? And he had a weird expression after that.
I know we can't trust his expressions but this is after he watched the video. Even before that, I'd say that his expressions were justified when he told Imlie that he trusted M more than himself. So, his doubts were real but his trust in her was stronger.
If my theory is right, Adi is not going to react much tomorrow too. Because he's looking at the bigger picture right now. He cannot afford to risk it with these comparatively minor issues.
The only thing that is still bugging me is that he deleted the video without consulting Imlie. Why did he not talk to her about the issue and ask her for help? The only convincing reason I could find is that he knows how impulsive Imlie is and how she wanted that video to play in the court. He probably had no time to convince her before the court session and did not find the chance to explain to her after that, hence the desperation for the lunch date.
PS: I am in no way justifying this track. I hate this to the core. I'm just trying to make sense of AKT. No other character has been butchered in the show. Everyone is the same to me. Even the Ts, were all lovey-dovey with Imlie but were ever ready to sacrifice her at the alter of Malini just because she was their naukrani. AC, DC & MC are the same. Meethi was always a doormat to those who abused her. Be it Nani or AC. She never cared unless it is about her daughter. So, SK and Meethi too are the same. So why will only AKT's character be ruined?