Why do guys brag about how many girls have liked them?

So my friend whom I liked for awhile, who I thought was different from all the other guys I liked since he was my friend first. But today I just heard that he was bragging to one of my girl buddies that "Oh so many girls have liked me, Jayne, Bianca and Kyla" my friend Shari told me he told her this and I couldn't help but feel offended. Now I did get over him, but I still thought he was cute... but ever since he said that... It's been a total turn off.

Why are guys like that? I thought he wasn't the kind to brag about that kind of thing. I think I don't know him anymore. and his niceness feels fake now. I might just be too angry. But what should I do about this? I hate him for that.
Why do guys brag about how many girls have liked them?
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