Why would my crush stop saying hi, stop speaking to me and ignore me all of a sudden?

HoneySpiceSugar
My crush used to be so friendly, he would always say hi and speak to me. He also used to look at me a lot and stare, smile when I caught him looking and he would not look away.

But now, whenever he sees me, he will look the other way, turn his head real quick and act like he didn't see me. He avoids me and ignores me when I look at him to get his attention to say hello.

We are both in our early twenties, if that helps.
Why would my crush stop saying hi, stop speaking to me and ignore me all of a sudden?
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