What if-
Mauli told Nandini about the child in the video in the end (just like Mauli was the first to know about Nandini's pregnancy, Nandini might be the first one to know about it too), but Kunal got the video, listened just the beginning or didn't listen at all & jumped the gun that Mauli was still trying to influence Nandini. Mauli would think that even after knowing about the child, Kunal has decided to stick to his decision & Nandini was still supporting him, further killing that last point of persuasion by Dida- Radhika. And she would think, that Kunal-Nandini don't care about the child too. I think the scene where Kunal-Mauli are trying to talk or the scene where Kunal shows her the video & questions her about that is the point where Mauli thinks Kunal-Nandini knows about the child (even when they don't) & still Kunal is saying all those words to indicate he doesn't care about the child too & her dialogues might be written in an ambiguous way to indicate to Mauli-child's future but Kunal would think Mauli is still talking about their future together. She would also think the same of Nandini too.
I mean sending video to Nandini doesn't make sense anymore since Kunal has made himself clear. She sent it to Nandini but Kunal happened to receive it & that's when they again had a talk where Kunal further insulted her.
If that's the case, then this might be a strong point in Mauli's favor in future when Kunal might confront her about the child & Mauli can use the video as a proof to tell that she didn't hide it from him & question Kunal on how he chose Nandini over his own child. (Even though Kunal might know nothing about the child at all).
Truth about the child is the only thing that is left to tell Kunal. (I just feel that the guy should know about the child & then stick to his decision to be with Nandini, even though he doesn't deserve to know about the child).
If that happens, then leap will go on to have a communication gap between Kunal-Mauli about the child. Mauli might grow on to think & hate Kunal-Nandini for having wronged their child. On other side, KuNan might have a stale phase of marriage because of no children & that leading to some issues between them during which the child might begin another silsila.
P.S- If that's not the case, then I don't know why exactly is fight shown again between Mauli & Kunal since last time Kunal made himself pretty clear & Mauli seemed to have got that in her head. And she sent the video to Nandini thinking she might understand her but Kunal intercepted it. So, when they have this conversation, then Mauli might think that both Kunal-Nandini know about her pregnancy & still don't give a damn to her & the child.
