Go, forget about him, and have a fabulous time.
Also -- continue on with ignoring him, but try to get even better (no faces, etc.) It's clearly driving him nuts. Don't let him win by stooping to his level and answering his inane drivel!
I'm not even sure what he means by "stepping out," but he just sounds like a giant loser. A sing-song voice? Is he four? You are so lucky to get rid of that loser. FTG!
Married: 11 years, no kids
Character is destiny
Listen, these types always like to make accusations about their BS's morals and suggest that WE are cheating OR doing something wrong. My STBX was actively involved in a PA (which I thought was just an EA, but later got proof that there definitely was sex) with our daughter's friend's mother, who lives 3 blocks from us, and do you know what he was doing during that time? Accusing ME of having a long-term affair with my male friend, who literally lives an ocean and half a continent away. Just ignore your WH. He's pulling from the playbook and he isn't even original.
I say stay out all night or at the very least come home late with a big smile on your face.
and GOOD FOR YOU for going out!!
He can only ruin it if you let him.
Have a great time and do not even think about him!
And I hope you had a good time.