He ignored my DM?

So I was finally able to muster up the courage to DM the guy I’ve like on instagram. He is my cousin’s best friend and I’ve known him for as long as I can remember (5 years old). We are both now in high school, I am 15 and he is 17. He was really nice to me last year and asked me questions about what sports I was doing at the moment etc. and I would hang out with him and my cousin, but this past year I began to see less of him and I was really wondering why? I DMed him yesterday saying this:

“Hi, Corbin (his name) :) It’s been quite a while since I’ve last heard or seen from you! My Tía says she hasn’t seen you around much either. I occasionally catch David (my cousin) around the hallways but haven’t seen much of you lately. How’s everything been going?”

And it’s been 24 hours since I sent that and he hasn’t responded. I know he definitely saw it because of the change in followers he had and I’m not dumb to not notice that, I’m really upset because I thought he was nice and all and I wasn’t flirting with him, I simply asked how he was doing. Why would he do that?
He ignored my DM?
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