Why is he acting in a mean way?

I confessed got rejected by my first love. After trying remain to cool about being rejected I unfriended him from all social but I never contacted him or met him in person. I accepted his decision. After 1 years we were in same event somehow I notice him, he was hiding his face with his hand which again broke my heart. After one week we were in the same room, seeing me he went other side of the room, then he sat beside couple of people from me acting indifferent.

Why is he acting in a mean way?
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