Social media trouble!

Mr
Am I overreacting!?? So my fiancé and I have been together for almost 7yrs. We just got engaged last year. We both have a our own Instagram account. I have pics of us all over my Instagram but doesn't like putting up pics of me on his. I ask him why and he says its b/c it's his Instagram and he just wants it to be only him on it, but he has a couple of pics with his friends on it!!. I makes me mad and it makes me think that something else is going on. He's a completely different person on there. He acts like someone I know he's not. I say well other guys put up their SO on theirs and just says "you just want what everyone else wants". WTF??? No I don't! Like why can't you just put up one pic of me on it?? Am I overreacting?