Acts like he likes me but says he likes someone else?

Okay.. Me and this guy are really close friends and he act like he likes me. Lemme tell you what he does... Flirts, is playful, smiles at me a certain way, gives me major eye contact, hangs around me a lot, tells his friends things about me (his friends have been extra nice to me recently), comes up to me just to talk about something I sent him or something we have in common, goes away from his friends just to hang out with me, sits/stands by me, stares at me. But he says he likes someone else.. He told that to a mutual guy friend and to me.. Why does he act like he likes me then?
Acts like he likes me but says he likes someone else?
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