AITA for not wanting gf to go to this concert?

I 29M and girlfriend 31F have been together for about 4.5 years, roughly one year in she cheated on me while out on a girls trip. She had sex with another man who looked like a famous music artist, she then put his name into her phone as the music artists name and texted him for a few days after till I found out. I was pretty tore up about it and figured that was the end. We worked through it and she pretty much never brought that music artists name up or listened to them with me around because it made me think about what happened all over again. She recently asked me if it would be okay to go to said music artists concert. Obviously the music artist had nothing to do with it but it was just the fact that the man she cheated on me with looked like him and his nickname was his name in her phone, it’s been over 3 years and she has been faithful and up to this point never brought the name or music up. What would you do? Am I crazy for not wanting her to go to the concert? Would it be better if I went with her which she wouldn’t mind that either?