Has he been paying you child support yet? I think this needs to be addressed.
While he may have equated unhappiness with his job as unhappiness at home, this is something he is going to have to learn are not related. I know how badly you want to fix everything. However your job is to take care of you and your son. He has to work out his issues. No one can do that for him. It also doesn't help for you to remind him. He will see it as you nagging or fixing or controlling.
Again focus on you and son. Keep conversations to the house and son and things related to those 2 things. I think I have told you before, the only people I know on here that saved their relationships were the ones that really dropped the rope and were ready and willing to move forward without their spouse. It isn't game playing but what you are willing and ready to do.
hang in there, kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory