Why does he keep mentioning other guys checking me out / talking to me and other people asking him if I'm his girlfriend?

A guy friend of mine (who I suspect likes me) keeps mentioning when guys check me out, or come up to talk to me. And he keeps mentioning how random people asked him if I'm his girlfriend when we're at events with a group of friends. Why does he do this?
Why does he keep mentioning other guys checking me out / talking to me and other people asking him if I'm his girlfriend?
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