Dating Perfection

I’m so afraid of making the wrong choice with a guy and I end of spending so much of my relationship on a rollercoaster, constantly in and out, up and down. This is so damaging to my relationship, and I see the trust that chisels away every time I say, “Maybe we shouldn’t be together.” It’s like I’m constantly looking for a reason to leave. I also have a strong fear of abandonment, which I’m slowly learning about. Anyway, I want to commit to the relationship I’m currently in, but I can’t stop the “what ifs.” I have so many fears! Any suggestions?