PS - these are good thoughts. It is good that your h wants to sleep with you. As you know we had a great marriage, but I am still glad that this has mappened, because I now realise that my h had stopped 'growing' and was dragging me down with him. By going he enabled me to continue to grow.
your h is bascially a lot further along the road than mine, and I realise that mine may never exit the tunnel.
But the OW is a problem in your r. I believe that if and when my h finally gets free of OW he will have to do some very serious thinking about why he went off with someone so squalid, stupid and selfish. What was he looking for there? Clearly these OP give our h's something they feel they need. I don't feel inadequate that I don't - I believe firmly in the Jungian shadow side that produces some unattractive desires. I don't think everything we want is good for us, or should be indulged!
Just my musings. Hope you get some sleep. I will pray for you on this hard and stony journey.