I haven't watched episode but read updates...I am thinking the whole thing about Yash is still confusing. Nothing makes sense for him to go against SidNi. Would Yash seriously do anything to lose his friendship with Roshni? What if there is more to the story, I mean what if he is not evil but is doing something to protect them both. Then there is something about why he dropped Sid's wallet...I think maybe he came to know something that could be in the wallet that could harm SidNi, so he might have gotten rid of it. But then why not tell Sid. To me Yash becoming negative makes no sense at all. He cares for Roshni and he knows how much Roshni loves Sid. Also, if Yash were to hurt SidNi then he would also lose DD's respect that she has of him.
This is what I think...YaSam might be pretending to be negative to both the audience and to SidNi and DD. But in reality it might show that both are doing to protect them all. Sid had thrown Shabnam out and she had vowed to take action against Sid and take everything away from him. So maybe YaSam were about to come to the Patels house to see the family. But before they could come maybe they had overheard Shabnam plotting something big related to SidNi. Maybe then somehow YaSam came to know that SidNi are headed towards Goa for a HM. They might have saw Shabnam following SidNi. YaSam might have done all that to divert Shabnam & her goons. In order to keep Shabnam diverted. They might even get into her good books by becoming negative and against SidNi, in order to catch her red handed and find out her plans. Whatever it is they might be protecting SidNi and not going against them.
Tell me if I missed anything as I am yet to watch the episode...