Why would a guy act cold out of a sudden?

My work crush has been very sweet to me and liked to make me laugh, he was enthusiastic when I talked to him or greeted him. Not even two days later he either ignores me or acts cold to me. Like he still making jokes and is talkative around other, except to me, it was kinda obvious. This hurt me tbh. Can't remember I did anything wrong ๐Ÿ˜ž

Why would a guy act cold out of a sudden?
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