Talk with a coach about the reasons for your previous breakups. If you are at fault for them, figure out what you did wrong. Your ex-girlfriends may have told you that you are self-centered. You could work with your counselor to change that.
What I’m worried about is that your fears will scare off the woman who actually loves you. If you keep your distance, you will ensure that the relationship will fail. Be open and trust the love she shares with you.