I know it's really easy for some of you guys to say that Sid should leave or that Em doesn't need Sid or maybe he doesn't deserve her or any of that other crap but you should all keep in mind one thing: nobody knows the circumstances that drove those two together in the first place, nobody knows how long the two of them been together, and if push came to shove, if Em had to make a choice between staying with Sid or leaving VH, she may very well leave VH to stay with Sid.
Not on VH. It happened on VV a few years ago. Basically the same exact thing that happened tonight happened with another set of three people but it was the guy who cheated on his girlfriend with their roommate. The girlfriend got super crazy and broke a piece of glass over the other girl.
The night of foursome after the party. And tonight while Em and Bob was parading themselves around in front of him. They may not have had sex tonight but she's already chosen him over Sid.
You obviously never had a girl break your heart. Calming her down is the last thing he should be worried about. Honestly, Sid needs to abandon this relationship altogether.