get to the root of of the matter.  How many long-term relationships have you had?  Have the men actually cheated on you, or left you? What about them caused them to do that, despite the fact that you're worth sticking around for?  (That's why we did the previous step, because you can't do it until you understand what it is you have to offer.)  Are you choosing bad men, or are they finding out that you're not right for them? If you're making bad choices, you're going to have to break your habits.  Without knowing what your habits are I can't tell you how to go about doing that, but start with being alone for a while.  I've found that in most cases like yours, women are so afraid of being alone that they'll choose any man rather than picking one with the qualities they seek.  They're not really seeking a man; they're seeking "a relationship".  But they're only seeing what the relationship does for them, and not really seeing the other half of the relationship as a person. If you're afraid he's going to cheat, figure out why he'd want to do that.  No, you can't just walk up to him and ask that, because he's going to tell you what you want to hear.  This is an exercise in how well you understand him, a crucial element of a real long-term relationship.  You already know in general what a man's motivations are to cheat.  The question is, what