I think Aditi's sister which was originally Aditi maybe had fell in love with Shlok. That is why she's taking revenge. I also think she's passed away too. I remember the entrance of Aditi when she was talking about siblings with Aastha and you could see that there was something that she was hiding. Just a little guess.
It's irritating because I don't understand how the family cannot clock on that Aditi is behind all of this. I personally think Shlok believes what Aastha says about Aditi. When everyone realised she went missing Shlok had even said "She only lies when she's thinking of others or when she's trying to save someone in need of help".
I hope Shlok finds Aastha in there. I just want him to prove that dog wrong. I'm very sure he will. They're all so f**king stupid and blind. Aastha has had so many accidents ever since Aditi had entered that house. I can't wait to see Anjalis face when she comes to know that Aastha was telling the truth all along.
I think Shlok is finally accepting the fact that he loves her. It's just every time she tries to help him Niranjans reputation goes down hill. Then Shlok obviously gives himself a reality check and reminds himself of Swati and all of a sudden changes. He just really needs to understand that Aastha will never leave him and will love him more than anyone ever has and we've all seen that in her eyes. Shlok has major trust issues lol.
As much as I hate Aditi I don't think she's thinking all of this through. I honestly don't think she's a bad person. We know she's not doing this for Swati because she doesn't even know who that is. I need to know everything. I'm so impatient.