I was suppose to create a post on this
As per manu Punjabi s review Rashmi and arhaan are in a relationship and not coming open in public. That Rashmi was telling paras that u join hands with Vishal but see that arhaan doesn't get overshadowed. Then paras suggests her to create love angle with him. Then Rashmi says r u crazy I am going to settle down next year. Paras asks closeness she says very close but no romantic feelings.
So in my perspective she isn't in a relationship with arhaan and don't want to create a fake angle with him on the show or there is someone else with whom she is involved with.
So the bottom line is Sidra shippers ki vaat laggayi. For all those who were waiting for Sid Rashmi dynamics to change in the show.