You may regret not telling him/her about your feelings and if he/she is bisexual (like you claim) they are more likely to understand.
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
Other answers
I'm guessing you haven't told your best friend, by the tone of your question...
Good thing is, your sexuality is already on the table so your friend knows it's at least a possibility. (if your friend doesn't know, tell them and see how they react). Do you two flirt ever? Even if you think it's minor flirting, it still means there is some interest. If your best friend is single, you have the green light to let him/her know how you feel. Of course I know, the overwhelming worry of ruining a friendship is present-but you know your best friend better than anyone else-so only you can predict his/her reaction. He/she might get angry, confused, shut down, OR, your friend might feel the same way...
If this is eating away at you, TELL your friend. I highly down he/she will react negatively because (definately generalizing here), being a bisexual myself, I have found that the bisexuals I've met are pretty understanding in the sexuality arena. We've all had crushes on straight/bi/gay people.
I'm a female, in your situation but my best friend has a boyfriend right now. I missed my chance to tell her, and I strongly believe that if I did, we would be together. But she thought I wasn't into her the whole time, when in actuallity I was thought the same about her, and was just trying to maintain our friendship.
Go for it, and good luck.
tell her!(:
get over it and fine someone else but still be best friends :P
I, personally, would suggest talking to your best friend. Just because she's not lesbian, it doesn't mean she's not bisexual either. Like, don't tell her that you love her, at least not until you know more about her SO and, if bisexual, what side she's more leaning towards.
You can't do anything about love it's love if you love some one you love some one.
well if your best friend is truly your friend she would never do that. and if your boy friend was true he wouldn't do that
I think that it would be better to have your best friend as a best friend. You love your best friend and you would want that person to be in your life forever. what if you guys happen to be a couple. There is a chance that you will not last forever. It would be better to stay friends.
Try to think about it: Is his brother worth it? Could my best friend be that guy? You know, who has the things your looking for. I would pick my best friend, because you know him better than anyone else. He's your BEST FRIEND!
if you love your best friend the best thing to do would be to striaght up I LIKE YOU! and i never wanna lose you (:
i love my best friend :) that's what it means !
Ask him on a date.
Kill both of them and then laugh at there misfourtune
If your friend is Bi sexual, he is probably dying to tell you. Being a Bisexual my self, I would love to tell my friends, but I do not know them enough that if they would accept it or not. Anyway, if he is, it would be hard to tell because he would be keeping it to himself and not giving any hints if he was. Being bisexual, you are not accepted as equally as straight people that's why we keep it to ourselves. Only if you are willing to accept his choice in sexuality, you should just go up to him and ask him in person. Make him feel comfortable by telling him you won't judge him and would accept him.