My partner and I have been dating for a couple months and we get along great, both in everyday things and during sex. We're both outgoing but can be shy when it comes to expressing too-sweet behavior. I'm perfectly fine with that because I'm in no rush to get serious and I'd prefer to keep things as simple as possible. We're both busy with our jobs, so I don't need to talk to him every day and we each have our own space for personal things. What's thrown me off, though, is that he asked me during sex to make it official. Everyone knows that during sex you'll say anything and agree with everything, so naturally, I said yes.
Skipping ahead, we had sex another time and he brought it up again. Later, we were at an event where he introduced me to some of his buddies as his "girlfriend." I didn't say anything because it wasn't the time or the place — and even if it was, I wouldn't know how to bring it up. We talk and act like a couple and I really like him, but I'm scared that he might try to ask me or tell me something else during sex in the future. Whenever we see each other and we're kissing and he tries to get too sweet on me, I tend to avoid it and change the mood. It's not that I don't like him, but I just don't think it would be fair to him if he's into me more than I'm into him. And also, I don't feel like things said during sex should be taken too seriously. What do you think?