"Apart from 'get rid', what do you want me to do?"
Just read the responses. We want to stop shouting, stop getting upset and scrabbling around trying to get back to normal.
We want you to embrace the new place you are in and get FUCKING ANGRY. He already needed to have told her to fuck off. he hasn't. YOU told her to fuck off, she hasn't. So now you need to tell her again - publicly. Ideally IN THE MEETING if she plays that silly bint game, and you need to come out fighting.
He is NOT taking responsibility for this. Bringing that card home is not just thick, it's malicious, and you have to see this.
She overstepped the mark, HE should have dealt with it and he should have binned it. He didn't, he brought that shit to your doorstep.
You can't get BACK to normal, you can't get back to anything, you both have to understand that the relationship PRE-affair is OVER, you are now in POST -affair marriage. It can be BETTER after the affair than it was before, but that takes work, commitment, responsibility and a lot of him eating humble and creep-crawly pie.
All you can do its try to move forward together, with full honesty, full accountability and responsibility. He has to work day and night to win back your trust and to apologise and make amends.
Bringing a ffing card home from his bit on the side is NOT the way forward, it's an UNFORGIVABLE error.
Tell him to tell YOU why you should put up with him and his shit? why is it that YOU have to sit in a meeting with this 'woman' taking the piss out of you and you just take it for the greater good? Ask him to explain that to you in words of one syllable cos you can't quite get it yourself.