The thing is DFMil your H has issues, and until he addresses those your marriage is always going to be strained.
He may very well be unhappy with the marriage, but with the in law's involvement there's no way to lay blame on either of you.
The in laws are much like an affair wtih a third party interfering to the negative. I am sure you have heard this before.
Your H is terribly immature. There is a lot of emotional development that should take place in a person before they enter a marriage.... IF that development isn't there problems are going to arise...
Your H cannot manage conflict effectively in his life. He acts to suppress his discomfort rather than addressing the problem instead.
He cannot negotiate equally with someone else...
I don't know if he's compelled to please his parents or if they are just too involved in his life.
At this point he may be seeking out their advice but they are actively manipulating him as well or have been...
MIL he MAY end up having an affair when his parents pass away... THAT is my biggest concern right now here is that he is SO dependent on them emotionally right now that their loss is going to hit him so hard he won't be able to deal.
Particularly with his parents so heavily involved still I am wondering if he would even be willing to GO to family therapy...
You would need a really good FT that told his parents IN SESSION to lay off and let him live his own life
Lots of work there.
Him having an affair isnt' the biggest problem if he was... His parents are a much bigger problem. They would probably even support the affair if he started one would they not?
I don't think he would start an affair unless his parents endorsed it to be honest...