Speaking from a woman's perspective:
Your insecurity will drive her AWAY, as far as she can go. Women are TURNED-OFF by insecure men. Even good women who are geniune will sympathize with you, but they will avoid you!
Women (especially Hmong women) enjoy men who have self-esteem, even if he is not as attractive. Women need that security, because, heck, they are already insecure about themselves, but to have to deal with a man's insecurity, forget that! I don't mean that go ahead and play hard to get or be cruel to her, (don't get me wrong, some women respond to that) but give yourself some credit too for making it this far and being able to open your heart to another woman.
I know you are protecting yourself to you don't get hurt again, but with every new relationship, you have to take a chance, because you won't know how strong the relationship can be without sacrificing your heart. Yes, you may get hurt again, but isn't better than not knowing what it could of been?
Stop assuming that they are cheating, women hate that the most, especially when they are NOT cheating. That will only pull you both further apart. Women (good women, that is) like to know that their man trust them to some extent. Trust is the HARDEST thing to build in a relationship, and it may take YEARS to acquire trust in a relationship, but when you do, LIFE with that person is a breeze and a joy! But the again, it can be taken away in just a blink of an eye.
Hope that helps. GOod luck!