<human>: So I met this girl online, we chatted for long time then had one date, it lasted pretty long but I only got as far as kissing her. Few days pass and she calls me yesterday at 11pm saying she is coming over. Long story short we had an incredible sex that came to me out of nowhere, she stayed a night then left for work in the morning. 

But that morning when she was in shower her alarm rang so I checked a phone to turn it off and saw an unread message from some John saying are you home? (sent at 2am). I was too curious so I read some of the conversation and it was pretty clear it's just for sex only, but seems like she wasn't agreeing to meet him much lately. 

Now that's when my manly side kicked it and I got very jealous so I asked her who that guy is and is she sleeping with him? The answer was I did once 6 months ago. And now for some stupid reason I make her sent a text saying that she was sleeping over with me last night. She didn't want to do it at first but as I put it its either you do it or we are never meeting up again. 

Now what I don't get is why am I jealous?? I am dating with 2 other girls right now and she (26/f) isn't my type for longterm serious relationship. Yet thinking that she sleeps with guys other than me makes me feel like crap. 

Just small details that may contribute to understanding: I am very fit, quite tall guy, kinda like playboy type with a lot of self confidence and charm. John is 35-45 divorced with kid, quite fat and judging by a dick pic he sent her (oh god pls eyebleach) has nothing to brag about. 

I am meeting her again in a day or two, she seems very excited and willing to come asap. I just need to get this jealousy out of my head... I have Johns number and almost at the point of texting him to duck off... But I know it's a silly decision.. Any advice?

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<bot>: Have friend with benefits who I recently met, found through messages she is flirting with other guy and might be sleeping with him or not. Need any advice cause I feel pretty crap right now.