I know he refuses to go to MC or retrouvaille, where you could make structured progress toward making the marriage better. So you are left with hoping things go well.
Retrouvaille teaches that living as married singles is the cause of marital strife. To make your marriage better, you need to spend time together as a couple. So try to do things with him, even if its only watching a tv show together, or cooking a meal together. GAL is good when you are separated, but when you get back together, then you need to find things to do together too.