How to not get left behind

I'm pretty confused and internally torn and need some experience talk.

When your gf/wife/partner is able to freely and fully enjoy sex with all the passion with other people (and we can all assume she'll try to find better sex partners) who look better, kiss better, fuck better, eat pussy/ass better, etc., how do you not get left behind sexually? And in long term, potentially, how does it not harm the passion between the two of you?
Because (unlike many people I assume), I'm not submissive, I don't like humiliation nor do I have micro penis or anything like that. But I look boringly average, my sex drive and bedroom passion" is boringly average and I'm anything but a natural kisser. Sharing/hotwifing is also not my main drive/fetish that I could magically replace my actual sex life with.

I don't know if it makes sense. I'm not sure how to explain this uncomfortable feeling of potentially getting into situation where a "regular relationship standard" would be slowly (and probably subconsciously) eroded and eventually replaced with a passionless quick kiss on the lips and occasional sex as a chore from her side.

Because, to be completely honest, I'm not sure I myself would be able to keep that sex life and passion up long term if I were in a situation where I could have freely passionate sex with women who'd look better, fuck better, kiss better, be more experienced and passionate in the bed than my gf/wife/partner. Sure I'd love her but some pieces of the relationship puzzle would be missing.
 
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