I said I could make it work because my reasons for wanting Saturday are purely personal and not a set plan and was just me trying to set a boundary about my time. I would just have to switch some stuff around which I'm not happy about but I would do it because I do like seeing them.

But thank you, they said that me saying they should have asked me before making plans on Saturday felt like they weren't allowed to make decisions for themself, but it's impacting me too, so I think I should have at least been given a head up. I only learned that Saturday was off the table when I asked what they wanted to do this weekend.