Maybe you should just count your blessings you're out. This woman might treat every man as Mr Right Now. Who knows if she will ever find her Mr Right? Is she even looking? The way she keeps saying, "It's what MEN do." She may not have the ability to commit. You are right, she is "wrong" in dumping a better bet, but it's not up to you to fix her or tell her how to be happy, and that might be the more important question here. Did you have a parent you had to cheer up or take care of somehow? Why is it so important that she accept YOUR view of what is right? This is care-taking behavior, not adult to adult. I FINALLY figured out that I was insulting my partners by telling them I could help them by loving them.