Really, anything can happen right now.
I also thought for Pallavi to really realize how obsessive Mandar is, he must do something that really irks her and sets her off. I can't think of anything else besides what you said - physical harm - that would cause her to really cut him out of her life. She's too good-natured and sympathetic towards his plight to cut him out in any situation besides that.
I hope Raghav comes to save her, or she's able to save herself if it comes to that! Mandar looks like he's really going to go crazy soon.
maybe mandar will go crazy and do smth which will break Pallavi's sympathy for him and she'll start hating him, and on top of that raghav will save her and hurt mandar's ego
and then after this mandar will attack raghav's business to take revenge from both of them and he'll blackmail pallu into living with him