Why would a guy say he hads feelings for a girl and later said she’s stupid, slow, and too weird? He also seems irritated when she likes other guys?

He said he hads feelings for me and he say it’s pointless to talk to me because I don’t like him and I like this other guy who’s nicer and respectful.

Why would a guy say he hads feelings for a girl and later said she’s stupid, slow, and too weird? He also seems irritated when she likes other guys?
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