<human>: Hey /r/relationships! 

My girlfriend and I are very open with each other, and have since discussed our sexual pasts when we entered the relationship. Unfortunately we haven't had sex yet due to me having HPV and awaiting for it to clear itself. She has a pretty clean track record compared to mine. Only a handful of partners, 5 less than me, most of which were her boyfriends at the time. And I haven't had a girlfriend in years until she came along. However, the last person she slept with before me was an older man about three times. Now, I consider myself very open sexually, so it took me by surprise when this little factoid disturbed me so much.. I guess I was a little repulsed initially. It put me into a spin of anxiety and some retroactive jealousy. So much so that I began asking for details which made matters worse. She's told me that "It wasn't even that good", "She wouldn't do it again" and that "she prefers younger men anyway". But now I can't get the image of my girlfriend sleeping with this guy out of my head, it's haunting and sometimes when I'm with her the thought of her with him creeps up. She knows what I'm going through and has been very understanding. I guess traditionally I saw older men that prey on younger girls as creepy or whatnot? perhaps. And I know I would sleep with an older woman, given the chance. But no matter what rational perspective I see it through, the anxiety doesn't settle and the intrusive thoughts just won't leave.
 

She's a very sweet, trusting, and loving girl so leaving her isn't an option. So I guess I'm asking for some similar stories, advice, and some hope on how to get over this ordeal so we can get on with this relationship?

Give me a shortened version of the text
<bot>: Girlfriend slept with an older dude three different times before she met me. For some reason it's bothering me way more than I think it should.