....how much contact have you had since sleeping with him? Did you send some overly emotional messages after? Did you send more than one? Im just trying to work out why you feel so embarrassed/ashamed.
If you've just been calm and casual, but ghosted, then please don't feel embarrassed, hes got the problem not you and you havent done anything wrong. You had sex (hope it was good) and you got yours. Try and find the empowerment in it, and try and shake the emotional attachment to it, and put it in the past. Its happened and it not your present...... Next!....
Oh, and if mutual friends find out, or your worried about what others may think.. if it ever comes up, just go with the absent minded response of
"Oh yeah, Clive, we had a date and i slept with him, god I had forgotten all about him, he was pretty dull/great/lame, dont think we spoke again after... anyway, ive met this great new bloke/dog/log on my socially distance walk.... blah blah blah"
Don't give it head space op x