Sounds like a control freak. Is there any way you can pay for this yourself? Why were you depending on your ex for your vacation? This behavior can't be a surprise, probably like his normal way of doing business. He will alienate his girls and never understand why they dont' want to spend any time with him. He loves the idea that you would jump by driving to him when he demanded it. Don't fall for it again. I would tell him I don't want it, and if he wants his girls to go to send you a money order and you take them.