Broken Trust

So I know most women can relate when it comes to relationships and trust. I believe we have all had that one boyfriend that ruined it for the rest and the women that have not had that experience- consider yourself lucky. Anyway, I had that boyfriend that ruined trusting a man for me, so everytime the one im with now does something that seems kinda shady i automatically get a defensive and think this nigga is up to something, and hes not up to anything. I honestly have a hard time believing that I got a good man. Ironic. Im so used to gettin the bad ones and now I got a good one Im lookin for the bad so that its like i knew he was no good just like the rest. Sometimes I feel like i need to pull out before he hurts me but he hasnt done anything to make me think he is going to. Even when we first started kickin it we agreed not to fuck eachother over (yeah it was said in those exact words). So my big thing is is how do you learn to trust again? Really? I swear its been 5 years of breakin my trust in men how can I think it would be rebuilt in 6 months. I think that I just need to have faith in him. because he sure as hell aint mwa or mcd.