What does it mean when a guy smiles at you but the smile is crooked?

Casper286
I was talking to this guy that I think I might like and every time I told a joke (I'm usually very funny) he'd either laugh or smile but he smiled with only half his mouth like this: https://i.imgur.com/DXn70dc.jpg
What does it mean? Was he flirting with me or did he not find my joke funny? Or was it both?
What does it mean when a guy smiles at you but the smile is crooked?
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