Are you talking about girls who 'fool around'? The correct word for that would be whore.
No, not that type, although it's pretty hard to know these days whether a woman is loose or not if she decides to put on an act.
No, I'm talking about the type that can't level, that will get deeply involved with a guy and then drop him on some pretext.
If a woman is willing to do that, without being able to honestly explain the real reasons, then why should someone think she would keep wedding vows?