Good morning Maggie, I am not sure if being unreasonable about the holiday is really the issue. You may feel he is being unreasonable but he obviously doesnt as in his mind you and he are spearated.
I appreciate that this is a very difficult time for you but if you and he continue to be in contact this does not allow you to have closure and move on (he has). You don't mention if you have children so I am assuming not. If you dont have children then there is no need to be in contact, this could be done through a third party ie your solicitor. If you do have children then you both must agree to set times for visits etc and stick to it. No chit chat texts of phone calls, no just dropping in for a visit.
Whilst this current situation continues you are not moving on, what about you? What about your future?
I am sorry if this sounds harsh but a long and protracted break up is only delaying the inevitable. Be strong, think about what you want, a reconciliation at this stage seems unlikely so think about drawing a line under it and moving forward.
I sincerely wish you the best of luck.
warpig