Why would a guy choose to date a girl with small boobs if he could get a girl with big boobs?

There's this guy who seems to really like me. He is very handsome and nice. He can choose from almost any girl he wants. I have small boobs AA cups. Another girl seems to be interested in him, she is very pretty and has big boobs D or DD cups. She always try to flirt and show her cleavage to him. She has a very nice body in shape of hourglass that men like. He seems to ignore her but he always smiles at me and tries to talk to me. His friend told me he really likes me. Why? He can have a woman who looks like a woman but he would rather be with a girl who has very small breasts and almost no curves? I feel that I'm not enough woman for him and maybe he just wants to pull joke? But he doesn't seem like the man who breaks girls hearts.
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All these answers were horrible.
Why would a guy choose to date a girl with small boobs if he could get a girl with big boobs?
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