I need some advice...

My boyfriend and I just recently had sex for the first time. And it was great, but I’m nervous that our relationship is gonna be revolved around sex and I don’t want it to be. We haven’t been talking as much lately, granted we’ve both been busy, but if we do talk it’s about sex. I brought it up to him last night, and now he’s mad because he thinks that I think he’s just using me for sex, but I know he’s not. I know I probably shouldn’t have said anything. But I need help?😬