stupid concert.

Okay my BF has never been to a concert so about 3 months ago our mutual friends invited us to a relatively inexpensive concert to see a few bands, he declined and I did too. A month later his cousin invited us to see some Columbian artist which I said no I didn't wanna go and he also agreed. Well this month we again got asked by this same cousin to another concert with some Hispanic rock band; I said no way! And it was way over priced. I didn't like the band and I wasn't paying $100 to watch something that I don't like. Anyways my BF begins to complain that I don't let him go to things and that they bought their  tickets already and we can't go cause we won't be with them. Mind you he also only knows 1 song from the artist. Which means hours of listening to music we don't know. He blamed me for telling his cousin no. Well do you think he should blame me? I was honest I didn't even think he wanted to go until yesterday when he complained about not being able to go. Am I wrong for not wanting to pay $100? When the tickets for the other concerts were $40? I'm tired of being blamed if he wanted to go he could've told me and we could've gone with the "big group" from his family. --- Okay I needed to vent and know if I'm just crazy?