Girl problems

This guy I felt like I was messing with heavy and I had sex for the first time after 5 months. And now I feel likes acting different. Like the other week he told me I worry for no reason that we are find but this last week he's just been what I feel like is distant I think maybe he's trying to do the right thing and stick around but doesn't really want to. He hasn't called me boo or baby like normal we've been talking less than we normally do. It's still a lot just less. He hasn't reassured me in anyway that he wants me still but I keep asking him if he doesn't want me just leave don't play with my feelings and he won't. He's only the second person I've ever been intimant with and I really just want to pull away before he does the same but I don't want to give up on this because it could be something am I over looking it? Am I making this hard when it's really not. Or did I fall for a guy let him fuck and now he doesn't want me anymore? And if that's the case I can't picture myself ever letting anyone in again.