Need advice, not sure what to think

Hello ~ I've been reading posts on here and decided to join to ask some advice. I have been married 6 years. Second marriages for both me and my husband. Everything is great, we really have no problems. Communicate, good sex life, all of that. The other week one of his friends was over and made a very odd comment about some woman my H had picked up once. The way he said it and the way my H looked at him made me very curious. The guy quickly shut up. But later I asked my H about it and it turns out that one time he found a woman on craigslist and met her at a hotel for sex. I was dumbstruck. I said 'you f'd a hooker?!' and he said 'I guess you could call her that' I asked if he had paid her and he said yes. So this happened years ago - he was divorced for 10 years before we met and this happened during one of his 'dry spells'. He said he felt gross about it after and never did it again. I didn't want to make too big a deal about it, it was in the past. There are a few one night stands I have never told him about in my past, so I just figured this was something he just didn't feel was relevant to tell me about before. So I didn't ask him anymore about it. But it DOES stick in my head. And I don't know what to do about that. I don't want to beat a dead horse with him about it - what could I possibly gain by questioning him further on it? He's not someone I fear is going to cheat on me or anything like that, so I don't know why my mind keeps thinking about this one incident. Is there anyway to make myself stop it?

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