Am I worried about nothing?

So me and my boyfriend recently discussed the fact we will both be going to different high schools next year. We agreed if things don't work out we would still be friends. He also told me after that I meant a lot to him, which really touched me and made me happy. The next day however, he suddenly was really quiet. He's usually a rather talkative person so I was a little worried. He talked to his friends like he normally does and even talked to my friends more than he normally would. When I try to initiate conversation, he replies, but then goes to talk to his friend or my friend. It's been like this for three days, and I know that's not very long, but I'm afraid nothing will change if I don't ask him about it soon. Any recommendations are most graciously appreciated :)