conditional nice guy

A man who takes on the aspects of a nice guy, but only until he is rejected. At that point, he will abandon her and redirect his efforts toward other girls. While the result can be problematic for the girl who just rejected him, especially if he previously went to great lengths to do nice things for her, he will justify his behavior with the claim that he doesn't like being used.

Me: "I'm a conditional nice guy."
Other guy: "So you're a douchebag?"
Me: "No, I am a nice guy, but only until she rejects me."
Other guy: "But she has the right to say 'no'."
Me: " I hate being used just as much as she does."
Other guy: "Touché"