I don't think this is workable at all HF...

There is just no way you can continue contact for life after an EA with a man your DH has basically said he will pick keeping his friendship with over your marriage.

Can you expose OM?
If you let the whole world know that he is coming on to you, you have feelings for him and have told him to stay away and he won't-- you need his friends and family and GF to know what he is doing and to help you???

I think exposure from you and a No contact letter from you to OM might be the only way.

ME: 33 W DH: 39
3 Kids 11,6,baby
My 2nd M-His 1st