choking me during sex?

So my fiancé was Ontop of me and we where having sex and we where both getting really into it and he put both of his hands around my neck and pressed down hard but not too much because it didn't hurt that much, but when he did that I don't know why but it really turned me on but a few seconds later he kind of had this horrified look in his eyes like "wait, what am I doing?!" And he stopped and took his hands off, I think he surprised himself. He's my first and I don't have a lot of sexual experience so I didn't know that o was into that until it happened. Maybe he likes it too but he didn't want to tell me? I'm kind of embarrassed to talk about it with him and I feel like he would be embarrassed too. What do I do? Should I try it too and see how he reacts?