Have you thought about moving out so you are away from both these men while you sort out your head? Even just a long holiday on your own?
I DO know how you feel as I have got that T shirt. It's awful.
If all sexual love has gone for your DH then you have to ask if you can get it back, If it has gone, then it may not be wise to go straight into another relationship until you worked out WHY it went wrong.
You have some hard thinking to do.
You could decide to leave your DH and the OM might not want you when the gloss/lust has worn off. How would you feel then?
If he is wanting one last chat, I'd do that. But then if he really loves you and wants the best for you- and that best is you staying in your marriage, then he should do the decent thing and back off. If you then decide you want to leave your DH and do, and OM is still free, then you can try again.
I know this sounds hard and clinical and believe me, I have been in your shoes, and couldn't take my own advice. But try.