Confused as to what right he has to not let her in room? Isn't that her room morally? He can't refuse Seerat when she wants to change his bedroom fully but he can ask Sahiba to get out of a room that is hers too.
So he and his mom forced her to stay in the room when she didn't want to but keep kicking her out when they mind her.
Nothing changed though, Garry put Daarji in jail, she bailed him out and got send to storeroom. Same here, Angad got himself in jail by faking Sunny Sood identity and now that he is out due to Sahiba, he asks her to get out. Ab tak nahi bola tha because he lost his house and bedroom, nahi toh jail se nikalte hi Sahiba get out.