It is OKAY for him to have an extra marital affair. To sleep with his girlfriend despite of being married. WHY? Because he's a man? Oh, I am sorry. I fail to and would not accept this. Not meaning to be rude here, but the story line went a notch too unreasonable and disrespectful towards a human being per se, leave alone a man or a woman.
Abhi did do a favor to her by proving her innocence (something she wanted to do but failed badly in it). She did mention that she was hurt that he did not trust her and only expressed her belief in "kumkum" as in a lifelong bond of marriage.
Just think of the MMS getting out even if she is married to Suresh or stays single, it's not gonna be okay for her at all. And she is no celebrity to get away with that either.She needs to hold Abhi accountable for various things, but for proving her innocence, apologizing and even going against his own sister publically, she should be thankful to him.