I need important advice!?

I've recently started a new relationship after leaving an abusive, manipulative relationship over a year ago. I still have lots of trust issues, and it's affecting this relationship. I keep expecting him to reveal his "hidden agenda" and be a user, or a manipulator or worse. I don't believe he is any of those things, but every time he does something that "triggers" memories, I start doubting him. I feel like I should explain to him why I have a hard time trusting, why I seem to pull away, but I don't want to seem weak, or damaged, or give him the opportunity to be manipulative because he knows I can be manipulated. Should I tell him, or work through it myself?