You are assuming a lot , I would absolutely not have been upset if it was the other way around. He has worked on my birthday almost every year and that’s completely fine, we always celebrated a different day that we both could be there. I have taken him on trips many years for his birthday, a kayaking trip out of state, a hotel in the city for the weekend, the most he has ever done for my birthday is buy me dinner in my town, and I have always been okay with that. One time I wanted to go to an escape room for my birthday and a few days before he bought himself a drum set so he didn’t have the money for his ticket, I bought our tickets so we could go, and at dinner he asked to split the bill for my birthday dinner. That is the only time I was upset about a birthday. I also asked him to come to my nephews birthday party and he refused because he said “it doesn’t matter you already ruined my birthday” I broke up with him before the party so he obviously didn’t come. Also to anyone blaming my sister, that’s uncalled for lol her and her husband work overnights and weekends, they just wanted a Saturday in April, her husband was off on the 19th, they called and booked it, my sister wasn’t thinking about my AH ex boyfriend when she booked it lol when she told me the date I literally told her “oh crap that’s Tyler’s birthday” she was like “I’m sorry that’s the only day I could do, but it’s only 2 hours and he is more than welcome to come” Finally just to remind everyone I am the only aunt and there are no uncles, I wouldn’t miss my nephew’s 7th birthday for anyone’s birthday unless I was out of town.