I know that feeling of wanting him to take SOME responsibility, but you could be waiting forever on that one. And even if he did, so you could "respect" him (or at least have a shred of it), would that really make you feel better about divorcing him? Or would it make it a temptation to stay to see what other changes might be on the horizon?
It's a tough place to be, where you are right now. Just try to keep in the forefront of your thoughts what is BEST FOR TG. Not what's best for him, not what would give you the temporary satisfaction of being "right". But what is truly the best, kindest thing you can do for yourself.
Hugs,