I would text him and say something like this: "h, it would be most helpful to all of us if you would run your requests for time w/the children by me. There are times when we may have plans and/or I am in the process of making plans for the children, when they will not always be privy too beforehand. I am more than willing to work w/you on the visitation and again, it would be help to both of us if we could coordinate times to spend w/the children on the weekends. Thanks!"
I wouldn't like my bank statements going to her house. That's getting far too much into your personal business. It's almost like he thinks you are spending money on stuff not associated w/the kids and the bills. Can he not see the statements on line from the bank?
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.