For the first time we saw that Sonakshi felt awkward when Rohit spoke about Raima. She didn't like the fact that Rohit was describing an incident of his with Raima- an incident between a gf and bf.
But Sonakshi openly said that she does not want to be friends with Raima, isn't that itself a give away of her emotions for him. Rohit should have understood why else will she refuse friendship for someone she hasn't met unless she has issues. Rohit only had a blank expression for that.