If you think there's any chance of keeping the relationship, even if some things have got to change (and some people have pointed out some things which seem to need to change), have you considered a couple's therapist? Sometimes having an outside influence can shift change, and both sides can be more open and honest. At the very least then you both know you tried if there wasn't anything left to salvage.
Since there's kids involved, it seems worth the effort.
Since there's kids involved, it seems worth the effort.