STBXH left me last April and we have agreed that he has DS5 for alternate weekends and visits him on a flexible day after school each week. Ex works shifts so I have to be flexible on the week day access. However now he is saying the contact weekends do not work for him either and is demanding that I be more flexible to swap weekends to meet his changing needs.
I don't want to be flexible as we tried this when we first split and it ended up with him swapping weekends every month and I would often go with 5 weeks without a break. I also feel that it isn't very stable for DS if he doesn't have a set schedule of when he gets to see his dad.
The reason ex wants me to be flexible is that he has a hobby that involves going to lots of events all over the country. He is finding he has to miss a lot of these due to having DS. (This was also a problem in the relationship when we were together as he was never around.) I have offered to completely swap all contact weekends going forward to fit in with his event schedule, but he has rejected this as he practices his hobby on his current free weekends and doesn't want to miss out on this either. I have also said I will have DS on his weekends whenever he needs me to, but he says he will miss him and doesn't want to lose out on having him just wants me to be more flexible with regular swapping.
I am very reluctant to agree because I feel like both me and DS need a schedule. I've offered to swap occasional weekends (up to 3 a year) but he is not happy with this either and caused a scene when returning DS about me trying to make his life difficult.
Am I being unreasonable? What is the norm re flexibility with access?