Am I being used by my boyfriend?

I'm really confused. I've been in a relationship with a guy for two months now, and at first it was great. He'd text me constantly, to try to get to know me better, as well as to just talk, even when there wasn't much to talk about.

However, recently, he's stopped trying to communicate with me outside of things that we see each other at. I keep expecting him to seem off towards me whenever we see each other, but he acts as if nothing's changed, and shows me a lot of physical affection.

I might be overreacting, but it feels like maybe I'm being used. Like, he wants a girlfriend to love on, but it doesn't necessarily have to be me? It's the worst feeling ever, but I don't know what to do about it, because when I hint at us not talking, he gets kind of annoyed. Am I overreacting?