If it's all the same for him, either you or OW, perhaps you should point out that he is married to you and has a child with you, so you and your R have a greater claim to him. Though I don't know if I would want a H back that was SO wishy washy about wanting to be in the marriage. For goodness sake.
He probably does need a jolly good kick in the pants or a bucket of water over his head - to wake up!
Livnlearn
"The unexamined life is not worth living" - Socrates