IMO, I wouldn't turn into a b!tch. I would however, not be a doormat and set boundaries when necessary to protect yourself.
Just remember that boundaries aren't set to punish your H, but to protect yourself and your children. Do not set boundaries that you can't enforce or be consistent on.
If you are wanting to R your M at some point you need to be the safe place. That means being consistent. He fell in love with the way you are. That love is still there albeit buried at this time, and probably for some time to come.
The best you can do is to focus on yourself and your kids while your H is on his journey. Go out and GAL and do things you've always wanted to do but never had the time or energy to do. Become the woman that only a fool would leave!