It's great that you spend time with your kids and all, but you need to start GAL away from the house and without your children. It's best to get all decked out and walk through the room your W is in at the moment, and tell her you're going out and don't know when you'll be home. She'll be mad, of course, and ask all the typical questions.....but you don't answer, just repeat what you said and get the heck out of there. Plan to be out past midnight, anyway.
This is the only way you are going to start telling a difference in your feelings. I don't want you to give any excuses. We done heard all the ones where the kids are concerned.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!