Anxiety after sex...

Over the years I noticed a pattern, a few minutes after sex, I get really bad anxiety. I hide it very well so my partners never notice. I can have amazing sex and it still happens. When I’m in a committed relationship I always tell my partner about this because if they hold me and rub my back or comfort me after it can prevent it from happening. Super weird, maybe I have abandonment issues??

I don’t hook up with guys when I’m single often due to this. I just got out of a relationship and I had sex with a guy I met at the club last night. He was SO sweet, like to the point where he actually asked me for permission to move on from making out to more. After great sex he hopped in the shower because he had to leave to catch his flight home. As soon as he left my anxiety hit me full force. Mind you, when I was in my last relationship I never had it because we always cuddled after sex. I don’t know what’s wrong with me.. I know its not the sex, but maybe a fear of being abandoned?