Roshni will be angry on Sid for not telling her. But so much has happened btwn then that I feel she won't be mad for too long. Looking at the episode, Roshni was angry. She let it all out and Sid let her keep hitting him and say whatever the hell she wanted. He stood there. And then when he went to console her she melted right into his arms. There is no way she could be angry at Sid for too long. Been through too much. She has begun to fully and blindly trust her Sid. She knows deep down he would not do anything to hurt her. Which is why she agreed to go through with the puja.
So when the truth comes out, she will be angry. I think Sid will talk to her and let her get her frustrations out then explain to her. She will understand and trust him that he will fix everything.
I really do not think there will be any more major separation...