Is AUTHOR wrong in the post ? POST : Hey, I'm ready for some hard truths

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Background - we haven't had a very interesting sex life in the past few months. In part for medical reasons, though there were still things we could and havent been doing. To be clear, no problems with what she's done before me or judgement, I've had my own 'wild past'. So me, tired and irrational, is there listening.

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gf came home from a night out with her work friends. When she got in I woke up, we were talking about how her night was. Apparently they were reminiscing about some old times from a few years ago when they were single.  She says about a threesome she had with two of her friends and says 

"it was amazing, glad it happened. never would again". 

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The thought of her with the guy both turned me on and made me a bit jealous, though that's neither here nor there. I never had a threesome so it was something that became an unfulfilled fantasy when we became exclusive (she wasn't up for it anymore). It's still a bit of a sore spot as is it something I would have wanted to experience in this lifetime, but being with her is more important and long term. So this memory/sentence was a bit of salt on the wounds.

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So there I am, getting upset by what I see as this insensitive sentence for three reasons:

1 experience I'll never have with her (I know this is something I have to learn to let go of, I just dont know how, could appreciate advice there too)

2 seeing her reminisce about wild sex when we haven't had sex in ages makes it feel like we're all downhill from here (probably the only genuine one here)

3 Insecurity from this, why weren't we having drunk sex instead of her reminiscing/why would she let someone she cares less about have a threesome and not me (I know that one is petty)

So here's me two days later being crotchety and bitter, trying to let it go or figure it out and failing. not sure if there'd be any benefit to bringing this up other than making the situation worse (particularly about sex. once that's brought up as a problem I feel a line has been irreversibly crossed)

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TLDR - gf talking about a past threesome, saying 'amazing but never again', me getting upset because 

1 we didnt and wont do that together, 

2 we havent had sex in ages, 

3 insecurity, why not me. 

Now i'm still feeling upset two days later and am finding myself grumpy/aloof towards her. Hit me

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