Not that you're asking for any, but it's extremey hard to have any sympathy for you in these situations. You are bring this on yourself either by not being forthright with these women or by just being weak.

The question being posed, "How do you get into these situations when you are supposedly a rolling stone?", is valid.

What you need to do is not get involved in the first place. Since honesty isn't working go the opposite way. Take a photo of a guy and carry it with you. Any guy will do, but the uglier the better. Next time the female walls are closing in pop the big surprise and show her a picture of your true love. Tell her a long heart throbbing story about how you can't stand being apart from this guy. Oh, and come up with a name for him before you show the picture. That's a detail that will probably come up.

Or you could learn how to be honest with people up front. Either way will work.