Hi, RebeccaN &

I'm truly sorry for the pain you are going through with your girlfriend; it's awful when we are so insecure with our partner, and I know how sad it is to not be able to trust the relationship. Have you had the chance to check out the
links to the right-hand side of this page? There is so much information there, and it will give you a good understanding of how your girlfriend's mind works and some communication tools and techniques in order to help you deal with her better... .
I also would like to suggest some
Books for you to read that can help you deal with your situation. Another one (not listed at that link) is "Co-Dependent No More" by Melody Beattie. If you haven't read that one, I highly recommend it... .Your story reminds me of myself at an earlier time in my marriage, and that book especially helped me out of that hamster wheel of pain and confusion and begging and crying, in relation to my Husband's behaviors that sound a lot like your girlfriend's.
I'm so sorry for the situation you are in, RebeccaN, but very happy that you have found our family... .We'd really like to help