Trust issues

I'm in this new relationship with this new guy. I feel so bad that I'm bring issues from a previous relationship and I want to stop. I know he getting tired of testing and tight leash  but maybe I'm still hurting. I don't mean to do this to him but I know he getting annoyed  but I don't know to express myself to how I feel. I don't want to get back the other guy, that bridge is gone between us but I still hurt over it and I feel like I m about burn it with new guy. He's been wonderful but what shall I do?