wishing, You are the only one that can determine when you've had enough and can draw the line in the sand.
There really is no way to prove that he did his bill paying on purpose so that you wouldn't have a lot of money to spend on vacation, but I from my own experience, I would venture to say he is "punishing" you for going away on vacation. Some do this...but there is no way to prove that is what he did to you. His bills may have come due and required payment...
BTW, I was once told by a very elderly lady that when someone is in mlc, it is never over. They will continue to touch your life when you least expect it. She said that they will always think that we are in the background waiting for them to touch down periodically. I don't know how true that is, but in my case, it's happened and I've been divorced for 10 years. Unfortunately, in your case, you have children that will require both of you to be contact now and in the years to come.
Do what you have to do and get on the road so that you can enjoy being away for a bit. You and your children need a much needed change of scenery.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.