<human>: Can you give me a shortened version of the text?

OK, so here's the deal Reddit. I'm a 23 year old male, have been living with my GF for a few months. I love her and our life together more than I ever thought I could love anything. Unfortunately I think I'm going to screw it up.

I haven't been in many relationships before, just the typical high school and college dating. The problem is, two of my past girlfriends cheated on me. To make matters worse, they were the first girl I ever said "I love you" to and the girl I lost my virginity to.

Now, I'm fully aware that the past is in the past, and I was young and these things shouldn't matter that much. My biggest problem is that they do. Even though I know that my current girlfriend wouldn't do anything like that to hurt me, there's a stupid voice in my brain that's paranoid, afraid she's going to find someone else even though she shows absolutely no signs of it and has given me no reason to doubt her. I over-analyze every little thing, even when there's nothing there. It's not fair to her because she didn't do anything to deserve it, and if I could turn it off I would because it would make both our lives easier. She can tell, too, and it's caused a few fights between us even though it's not even a real issue.

So please, if you have any advice on how to prevent my unjustified paranoia from ruining the best relationship I've ever had, it would be greatly appreciated.
<bot>: living with my girlfriend, head over heels in love. I get paranoid because my exes have cheated even though I know this girl never would. How do I shut off my paranoia before it drives her away for god?