Treese, I know how hard it is to have your kid staying w/OW & H. However, if you continue to resist, H will just pull harder.
if H is not paying much attention to son, anything that will help to improve the R is important--and that is spending time w/S. Your S is old enough to form his own opinions on the whole matter. He should not feel guilty for spending time w/his dad. Focus on doing things that will make it easier for your S to stay connected w/his dad; he is probably hurting now. And be very, very careful not to badmouth OW or H in front of him.
This is coming from someone who has been there, so I know how hard it is. I worry quite a bit but at the same time, I do think H's R w/our child has improved. This made it worth it, although, as I said, I still worry and do not like it.
Stop fighting him if you can. None of us want to have our kids around OP but you really do not have control over the situation (unless you live in VA, apparently).
It would probably be a 180 for you to let him go and keep your mouth shut.
The other thing is that H then has to negotiate the whole situation w/OP and while the MLCers make stupid selfish decisions in this regard, it is reality nonetheless.
M: 16 years Bomb 4/07 OW 20s long gone Divorced 11/09 I remarried New Guy Cooperative r w/X regarding D