Someone who likes to cheat on their significant other, with no remorse for it.
Girl 1: So, I have a boyfriend.
Boy 1: Oh, I am sorry, I didnt know.
Girl 1: I didnt say that meant stop...
Boy 1: Uh, ok?
Girl 1: I totally dont care about cheating on him.
Girl: I totally ran into that chiswell the other day.
Girl 2: Ew! Does her boyfriend even know she cheated on him all summer?
Girl: No, and she doesnt care.
Girl 2: She should have told him before he bought her that diamond ring...