I can't stop picturing my girlfriend with a guy she saw before me. Will it go away? What can I do?

LawyerOnTheWay21
So, my girlfriend and I have been together just under a year. We're doing great otherwise, it's just that..
2 months or so before we met, she saw a guy for a few weeks and slept with him a few times. She since dumped him and met me.

Now, funny thing, we share a name, he and I.. I didn't mind too much, until she told me she saw him in a club and he said to her "I was the first (insert name)" and since then I can't stop picturing her with him. I can't stop thinking about the fact that he had his hands on her. I hate picturing the intimacy. I stumbled on a semi nude picture he had sent her when they were seeing each other recently which triggered the feelings getting worse.

We run into him at bars every so often and there is a short awkward conversation and then not much else, she usually apologises for the awkwardness and assures me that she dislikes him, there's nothing there, and he repulses her.. I believe her, but given the history I do doubt the repulsion..

It doesn't bother me that she had a 3 year relationship before that, but this bothers me.. I think it's the connotations of a cheap fling.. You know, lack of security, danger, possibly diseased, the fact that it was probably mostly lust and sex based. I really can't stop picturing it and thinking about it, even when we're together and I know i'm being completely irrational. I don't want to think of her as anything but mine.. And it feels wrong.

I love her, to me she is pure and amazing, but these images taint things. I compare myself and I get myself down because of it, and I don't want to start letting it affect our relationship.
I need to know if these feelings subside and go away, or if there's something I need to do, or I'm a paranoid jealous freak who needs to get a grip.. Thank you
I can't stop picturing my girlfriend with a guy she saw before me. Will it go away? What can I do?
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