self realization: relationship anxiety.

I have relationship anxiety. I've been pushing my SO away because MY anxiety, fueled by past experiences and insecurities. I hate this so much, it clouds my brain making me believe he's cheating on me, or maybe I'm not really in love with him. At the end of the day, I would die for this man and his happiness is mine. I believe he feels the same way, but my damn anxiety is choking me. Does anyone relate or has anyone related at any point in their lives? I don't know what to do.