I'm glad he settled down. I thought he might after his temper tantrum. Like a child, he thought you had taken his stuff w/o telling him. It's interesting that he wasn't concerned about the papers until it was time to pay the rental fee once again. It's all about control and he threw a huge hissy fit. When they feel like they are being cornered, they will come out swinging, which he did. They'll try to bully you, threaten you, etc. Been down that road myself.
Glad to read he came and picked up the boys. I'm sure he appreciated your call about the boys and their physicals. Yes, the h you knew is still buried very deep within him. Some day, that inner child will grow up and the h you knew will emerge...the question will be...is he the same, new and improved or someone totally different. Time will tell on that one. (No need to panic.)
Keep the focus on you and your little ones. Today is a new day, enjoy it as much as you can.
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.