Im closer to my boyfriend than my bestfriend ??

okay so I’ve been bestfriends with my girl bestie for about 7 years but lately things have not been the same. i get weird vibes around her and i don’t feel i like myself around her. I don’t feel like i can tell her anything either. I feel like i have to mold myself into a different person when I’m around her. But when im with my boyfriend of 2 & a half years, i feel like im completely myself with him without fear of judgment. i can tell him everything & im just completely comfortable around him.. is this bad?? i feel like a horrible person and im afraid to tell her because i feel like she will take it the wrong way.