It was over ten years ago. I'd married young to an abusive twat.
The OM was no angel but he showed me that a relationship could actually be enjoyable, not endless misery.
No children involved. I'm not with the OM and he subsequently split up with his wife. No contact now.
I've never cheated since. Now a happy, wife and mother.
I value that experience actually- bit of an insight into the complexities of human nature as well as giving me the confidence to leave.
On MN, I get the impression that I should be condemned forever.
My DH knows what happened all those years ago.