Am I a bad friend for having a crush on my best friends brother even after she said she didn’t like it?

i’ve been best friends with my best friend since high school we are now both 21, i’ve known her younger brother for as long as i have known her and i’ve always gotten on well with him and found him cute. in high school i had a thing for him in secret and only admitted it years and years after. recently in the year i spent some time with her brother at an event and we ended up talking lots and texting for two weeks after. at that point i really had strong feeling towards him so i came clean and told her. she said it weirded her out and that things would be different if i pursued him. we both agreed it would be best for me to stop talking to him. obviously she is the most important thing to me so i pushed my feelings aside but lately it’s been hard to ignore that i still think about him all the time. i don’t know what to do.

Am I a bad friend for having a crush on my best friends brother even after she said she didn’t like it?
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