I don't know, JA........I see this a little differently than most who have posted on your thread.
Every successful person I know is compulsive in nature. You have channeled your compulsive personality away from destructive behavior. That's a good thing. Would your wife prefer you to be a drug addict or a womanizer? I doubt it. Wasn't she attracted to you in the first place because you were not some little pencil neck wimp?
I don't see weight training as some idle hobby to be discarded because the wife doesn't share your interest in it. The lessons learned in the gym carry over to all life's endeavors. Intensity and determination and courage equals success in business and parenting and husbanding, as well as in bodybuilding. And it isn't a matter of priorities. There is ample time to give proper attention to all things, including your personal interests.
My first marriage ended badly......same type of crap I'm hearing here. Being a good provider, parent and loyal husband didn't matter. She wanted some worm she could outshine and order around. Sorry, not this guy. Best thing that ever happened to me. I am now married to a fine woman who shares my interest in weight training in every regard. She's way younger than me, way better looking, a former figure competitor who still loves to lift despite us having a pack of kids.
So sure, do your best to salvage your marriage. Sure, it's what's right and best for your son too. But don't despair, either. And the iron and steel are always there and always tell you the truth.