The only reason' Pooja had was Adi taking her for granted. And at some point we all take another person for granted. The solution is to be work it out. Idk if she talked to Adi about how she was feeling but if she didn't then how was Adi to know what she was feeling?! If she did talk to Adi and yet he didn't listen it's better to walk out a marriage than to cheat on the person. In this case she knew that Adi's weakest blow being cheated on. So knowing that as a wife - friend, it's horrible to actually do that to him. Sure she felt bad about it but how is that going to make the situation any better?