You haven't really elaborated on your experiences, so forgive me as I could be way off base here,but I think that taking the time to cultivate and nurture a foundation for a relationship before adding sex to the equation may be the way to go. That way you know if they're the vanishing type before you become intimately attached to them and it builds a strong foundation for a longterm relationship in the same breath.

I've found that making them wait usually weeds out the losers quickly.

Unless of course you run into those guys who like the hunt more than the "kill"...
They're a bit harder to weed out than the rest.

My apologies if I've got the wrong end of the stick and seem to be blowing smoke out my a.s.s. my intention really is to help, but I'm admittedly not sure of my footing in this reply and don't want to seem presumptious, judgemental or any type of a.s.s.holian.

Also, to touch on what Harley mentioned, its not at all that you deserve bad men or bad treatment, but it would be worth looking into what these guys had in common, what drew you toward them, and if there were any commonalities in the reason or manner they vanished.

Some insight into this will help you avoid these types of men in future and help keep you safe.

I hope love finds you soon, you are worthy of long lasting love and adoration.