Appu..we all have the same questions..at least I do..
See this is what happens when they release a 20 sec promo and we all jump to all kinds of conclusions :/ We don't even know the reason he's crying..we're just assuming that because he saw CheRon together..he couldn't handle it..but it may be something different! I think that he really cries because he thinks of his time with Sharon during the RDX party and how she was drunk then too..and stuff..but this time..she's drunk again (I'm assuming) but is with Shivam and letting herself 'close to him'..so it may be that those moments he thought were SPECIAL may just be mundane events for Sharon..you know?
Well that's just my opinion..I really don't know WHY he's crying and I can't wait to find out ..!