obsessing over someone that i never met while in a relationship

so to start this, i’ve been in a relationship with my boyfriend for almost a year and it is completely healthy. i also have extremely bad moral ocd and possibly maladaptive daydreaming. recently, i found a small band and developed a crush on one of the members. it was nothing at first, then it started to get a bit more intense. i started making up scenarios about her and stuff and i feel insanely guilty. i know it’s normal to have small crushes but this doesn’t feel that small. i love my bf so idk why this is happening and it feels like im doing something wrong. i would NEVER act on any of these thoughts, so idk if that makes it better?? but my brain is constantly yelling at me about how it’s wrong.

i have also become hyperfixated on the entire band now, i want to watch interviews and go through all their posts and stuff (i have adhd and posted this in the subreddit but people didnt seem to understand), but this also makes me feel guilty bc the only reason i got hyperfixated on this was bc of the member i like. my brain has made me feel bad for even looking at their accounts, i cant even follow them bc it feels like ill be cheating on my bf or something. someone in the adhd subreddit told me that i should tell him about this, but i feel like kinda uncomfortable doing that, unless he straight up asked me if i have a “celebrity” crush. he’s said before that celebrities were hot and stuff and i obviously don’t care, but the difference is that they’re actual celebrities. i just so bad for making up scenarios and everything about someone who’s barely popular. idk what to do, i need support.