AITAH for wanting my boyfriend to not cancel our plans we’ve had over his band?

So my boyfriend and I made plans back in March to go to a show, a YouTuber I’ve been obsessed with for years. I told him to put it on his calendar (as I did on mine) and it’s right at our anniversary so we decided it would be an anniversary date. He said hed “do it later” and didn’t put it on. Yet we discussed it for weeks and I constantly said how excited I was. Recently, I mentioned it and he said “oh wait I have a gig with my band that day at a coffee shop”. I was like okay? Well we’ve had these plans for months for cancel it?? That was your mistake and we’ve already paid for the tickets to this show. It created huge arguments over the past few days with me begging him to make the decision over what matters more to him, and it’s been non stop him “thinking about it” and taking to his band members weighing his options. I’m done at this point and telling him he would pick what matters more to him. Again we’ve had these plans for months and he made the band plans a few weeks ago after I had told him non stop to add the show to his calendar. Idk, I feel defeated right now and need some advice.