What's his problem?

Jennifer
So me and my ex became friends since he apologized for everything he did. I was over him so I was like whatever then. But I recently turned 21, and one of my good guy friends came over my house and got some beers, (he has told me he is curious about guys) so we are just friends. I posted a pic on snap chat & after he saw I was with my friend, he blocked me from all social media and deleted me from snap chat, why would he do something like that? I really can't see why he did that, any thoughts?