Did I do something?

Hii, this is extremely awkward to be posting but I can’t think of anywhere else to go. I, F16, have been talking to this guy my age a lot recently. We’ve known each other since we were both 5, and have been really good friends until now. We’ve been talking and I thought it was so obvious he really liked me, but I’m starting to think I was wrong. Like until Sunday last week he was calling me pretty or cute, talking to me all day, like just being silly?? On Sunday we went to a museum because we both love that type of stuff, and I’m worried I did something he didn’t like, but I just can’t think of what? Like even yesterday he sent me a snap first, but it feels like there’s not as much interest in the conversation from his part. I tried talking to him about, asking if I did something because if I did I’d want to know and make up for it, but he’s made it clear I haven’t done anything. I wasn’t really sure if I had any interest in getting into a relationship, but this hurts a lot more than I thought it would. I really like him, and I don’t know what I did wrong. The vibe was very cute and silly flirty from both ends, but now it just looks like I’m desperate. I haven’t talked to him at all today. I really don’t know what could have happened in the span of 5 days? I’m sure this is really confusing to read, but I just hope someone can come with some type of advice. Damn as I was about to post this he snapped me. HE’S REALLY CONFUSING ME💔