<human>: Can you summarize the given text in a few sentences?

A bit of backstory: I've been in only 4 real long term relationships in my past. I've dated, had a couple flings, some casual relationships, but only 4 real in depth relationships. However, in all 4, I've been cheated on. Some worse than others, but the consistant thing remains that I've been cheated on.
Now, I am in a relationship with a great woman who is kind to me, seems honest, and actually cares about me. But no matter how hard I try, I can't get over the fact that I just assume she will cheat on me. It creeps up on me. At first it's a soft voice telling me that she's going to hurt me, and it gets louder and the only way I can silence it is to do horrible things like check her phone texts and Facebook messages.
When I do these things, even the most basic of conversations suddenly turn sexual in my head. And anything with a sexual overtone just feels like a betrayal all over again (i.e. the worst thing I've seen is her telling her ex that she had sexual dreams about him). I then just upset and moody and just hurt even though I have no real reason to.
I know that looking in her phone and Facebook is a horrible and fucked up thing to do, and I already feel like shit about it, so no lectures please on all of that. I guess the advice I'm looking for is to those that have been cheated on, more than once especially, how do/did you get over it and learn to trust someone again? How do/did you move on when you've been hurt time and time again by your significant other who always swears they won't cheat?
<bot>: Girlfriend hasn't done anything really wrong, but I still can't trust her because I've been continuously cheated on. How do I get the fuck over it?