Husband can’t get over it

[Valuethatoflife]

Me and OH have been together for 10 years, bought a house, kids etc. A few years before we got together while I was having a bit of an off the rails time, I had a fling with a manager at work. It was never anything more than what it was and ended when it was found out by others at work. My OH got to hear of this before we had anything between us as we work in the same field.
Once we were together it became clear that this subject played on his mind, and has been brought up numerous times whenever there is an argument etc. I have always said that as it happened well before we were together he needs to work on it and have offered to support this but will not accept it being thrown around as an insult etc.
OH went to a work event and saw this old manager, who I no longer work with, now they may be working in the same company and OH has started to act cold and keeps saying snide remarks etc.

AIBU to expect him to deal with it, with my support and get over it?

I can’t believe he is making you feel bad over something that happened before you two were together. This is emotional abuse and he is off his rocker, I hope you manage to get some support

This just makes my heart sink. You've got absolutely no responsibility here, it's all him. You have to be firm that you're no longer discussing it.

If it wasn't that, it would be something else. OP shouldn't have told him, but can't change that.

It's the perfect excuse for him as she can't undo her fling, and he will use it again and again to remind her of why she isn't good enough for him.
He's the victim, you see. Her past has traumatised him.

I had to read this twice to confirm this was before you even met him. He's immature and it's not down to you to do anything but put him right: these feelings, and especially words to you, are not acceptable.