My boyfriend likes to brag about girls wanting him?

My boyfriend seems to like telling me that a lot of girls want him. Then he says he is joking after if I get annoyed. He has said a few times a lot of girls want/like him. I don't understand why he feels the need to brag to me. He also likes to tell me what girls he finds attractive and who his dream girls are (not me anyway lol). It kind of makes me jealous and feel inadequate. Why does he keep bragging?
My boyfriend likes to brag about girls wanting him?
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