Guy friend suddenly acting very distant?

So one of my guy friends has been acting really weird. I've known him since we were in middle school, and we've been relatively close. I've always considered him a close friend, and a couple of years back I even had a crush on him, and I was told that he was into me. Since then we both got over it and we've been good friends.

But recently he's been acting really distant. He doesn't talk to me in school anymore like he used to and he responds to my texts quite curtly. He just unadded me on snapchat...

I don't know why he's being so wierdly distant. We share a group of friends and all the other guys in the group are behaving normally, if not more friendly...

Any thought to why he's being weird? I'm really really confused and need serious advice right now...
Guy friend suddenly acting very distant?
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