Ahh I hate them too, but because the one's I've come across will know he has a girlfriend and because my boyfriend is really friendly, nice and kind, these girls think that he likes them or something or will end up liking him and try to put moves on him. One girl from his work got her best friend to message me saying he was cheating on me which wasn't true, and the next girl would flirt with him at school and say she didn't want me near him cause she liked him. At least with the second girl I met him outside of his class and made out with him right in front of her and after that she shut up. I don't like girls that go after taken guys, that's just bitchy. But I have to say that single boys are pretty much a free for all.