A
guy who is used by a girl though he knows it, yet keeps coming back to her despite all the crap she puts him through. The guy is invariably in
love/lust with the girl and will go through hoops/put up with her back and forth in the offchance that he might be able to date her. These situations usually result in the man being crushed.
Sometimes the guy can delude himself into thinking he just wants to be good
friends with her. This does not last long.
In the movie "He's just not that into you", Kevin Connolly's character (Conor) is a manpoline for Scarlet Johansson's character
Anna. He's always there when she needs him but she never has to give anything back.
Guy 1: What did you do this weekend?
Guy 2: Oh it was
awesome, Cara actually came over last night. She was having a tiff with her
boyfriend. I made her a great dinner and we talked and cuddled a little bit. Then she left abruptly, maybe got a text from him. But I haven't heard from her since then.
Guy 1: This isn't going anywhere is it?
Guy 2: Well, I think she'll eventually see I'm a good guy and we
work well together.
Guy 1: <rolls eyes>