Edit for more info: Thank you for your responses so far. A few things have been asked/come up. It's not like I want to cancel a big vacation; the original plan was to visit my parents for a week and then fly to Spain for another week. Moreover, we are in Germany with quite a lot of weeks of paid annual leave, we can also change the dates etc.
About me being sick last year and he taking care of me: my total downtime was 8 months and he didn't have to take care of me physically or had to take time off work. I was able to look after myself. He was supporting me mentally I would say but also reminding me a lot of how difficult it is for him that I can't function properly; for exampling cycling with him, trips etc. That's when he said things are always about me since we had to find new ways of doing things together. But I do get that he feels like I'm choosing the dog over him; I just couldn't forgive myself if she died while I'm on vacation.
So, my dog has just been diagnosed with a tumor that's not curable and she probably has only months to live at best. She's my dog, I've had her for more than 10 years, so before relationship. My bf and I both have two weeks off in March and we were originally planning on flying somewhere warm (we're in central Europe; haven't booked anything yet).
Then, my dog got the diagnosis which has devastated me. Since I don't know how much longer she'll live I want to spend as much time as possible with her and I just asked my boyfriend if instead of flying somewhere we could take the car to somewhere nice but closer in order for us to take the dog. I suggested we could go somewhere where he could ride his bike since that's his favorite thing to do. After I asked/suggested that, he got extremely angry, called me egoistic and that we're only ever doing what I want and never what he wants. I think this is ridiculous and makes me really question our relationship.
I have to say, 2025 has been extremely difficult for us as a couple and individually; I had to have 3 difficult surgeries and was therefore sick most of the time but am feeling a lot better now and getting back to my old self. This, and other things, has strained our relationship since we couldn't really do "couple's things" and he was really looking forward to a "normal" year and vacation.
Obviously, I'm very frustrated too but also know that I can't change these things and try to make the best of it.
If he doesn't come around I really feel I can't stay in this relationship; his reaction is very immature and harsh imo. How do I know if I should end my relationship over this or just wait for his frustration to pass?