I'm becoming a psycho GF

I have been cheated on in all my past relationships. So the longer my new boyfriend and I have been dating I'm getting paranoid and just waiting for him to cheat on me like all the rest. I read into things wrong..I dont know what to do. I feel like I have to break it off because I cant be in a relationship if I am unable to trust.. I dont know if I'll ever be able to trust anyone. And it sucks because he is such an amazing guy and I want to believe that he would never do anything wrong.