previous relationship affecting current relationship

Kelly
I'm going to back up a little so that this makes more sense. 
I am currently 20 years old. All throughout high school I dated the same guy. This guy was terrible for me. He cheated on me over and over and lied to me but I stayed with him until a few months after graduation. 
I was so trusting before he cheated. And now I'm so afraid to be hurt again that I watch my current boyfriend's every move. 
My current boyfriend is so amazing. He would never ever hurt me in a million years. And he just wants the best for me. In fact he is the reason I'm going back to school to continue my education. 
I trust my current bf with my life. I know for a fact that he wouldn't cheat or lie to me but there's always the thought in my head that he's gonna hurt me too. I lay in bed at night and worry that he's talking to other girls. 
Please help me. I have such an amazing future with this guy and I don't want to ruin it because of my anxiety. Any tips or experiences that might help me would be greatly appreciated! 
ALSO: I have very bad anxiety and I have had it my entire life and I take meds for it.