Am i a bad person?

So i’ve been with my boyfriend for almost 6 months now and it hasn’t been the best relationship and lately i don’t know if i want to end it or not. This past month him and i have been in constant arguments and his best friend was always there for me when i needed anything and i didn’t think anything of it and his best friend and i have become close and i feel as if i’m gaining feelings for my boyfriends best friend. Am i a bad person bc of this? i don’t know what to do. any advice?