anything I did with regards to the OW would be used to get back in touch with him.
So?
I mean, I'm not recommending you do.
But surely if their affair is over and contact has been broken and he's staying with you, there is no risk of her "getting back in touch", because he wouldn't allow it?
Or do you think he is still susceptible to her "victim act".
I would never know if she was telling the truth or not.
For now, that's true of both of them.
You know he's a liar who lies to you. He has everything to gain by minimising his culpability.
You have as much reason to trust him as her.
If he had actually pursued her I don't think I could carry on with the marriage.
Really?
Two adults made a choice to have a sexual relationship.
Your husband was one of them.
He chose to sleep with her because he wanted to.
He wasn't hunted down and "pursued".
If you could see she was after him from the start, then so could he.
And he liked it. And returned her feelings.