This is my reading of Shehnaz - and Paras was laying down some truth bombs.
 Shehnaz is prone to getting too attached to a guy, she’s needy and needs to be someone’s first priority. In her neediness, she does utt patang things and throws nakhres but she wants someone who understands that and continues to be there for her, keeping her as a priority.
The example for this is that egg task (Daljeet etc were all in the house) where she wanted Paras to keep her as priority, call her over and confer with her despite the fact that she was acting all silly/being childish. Paras disliked that and had a problem with that and this Shehnaz vs Mahira thing kinda came about from that moment. I think Paras got closer to Mahira from then too.
When Shehnaz looks at Paras, she sees someone who always puts Mahira as top priority and she wants Shukla to be like that with her, but he hasn’t been (in terms of the game) nor has he been emotionally.
She would prefer to have a Paras than a Shukla but the problem is Paras didn’t like the neediness, he liked Mahira cos she was always playing that hard to get, tu mujhe koi fark ney padta kinda flex.