Why did my crush decline my follow request?

We've known each other for a while now and we talk quite a bit. He knows my name, always smiles a lot, makes physical contact and I sometimes catch him glancing at me. So I requested to follow him thinking he would accept my request but he ended up declining my request :( I'm wondering what would have caused him not to want to add me back. I mean, he's very chill and we get along so I'm confused as to why he wouldn't want to add me online.
Updates
+1 y
He added other people too at the same time he deleted my request so I highly doubt its an accident.
Why did my crush decline my follow request?
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