Why would a guy put himself down constantly when in the company of the girl he really likes?

In conversation he will say negative things about his personality. Is he looking for a compliment? It's not occasional but regularly. Last time I saw him we had a great time but he was so agitated with me but we got on really well. Her calls me darlin' and really bigs me up. He seemed so goofy too and talking fast kinda like bippo the clown! I don't understand why he constantly says nice things to me but puts himself down. If he really likes me why put himself down?

Thanks!
Why would a guy put himself down constantly when in the company of the girl he really likes?
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