There is no "correct" answer because there are a range of them. However, the best thing to do is to show that you're not "against" bisexual or gay people and that you are a good friend. If it isn't true and he's not bi/gay, it could have hurt him slightly that you suggested it. Either way, be supportive! Good luck.
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Other answers:
You haven't really expanded on your question, so hope I answer it correctly. I take it you were unaware before that your friend was bisexual so your other friends think you are to. If this is the case, ignore it. Don't give up a good friend simply because they have a sexual preference and be your own man. Don't let others dictate how you should live. If you are straight you don't need to prove it to anyone and don't cop out on your bisexual friend. If your friend has not told you he is bisexual, then it could be vicious gossip. Being gay or bisexual is a difficult situation to be in especially if you are male. You know you are going to lose some of your friends, but the true friends stay together. Why should you care what others think? Never break up a good friendship over something like this.
Marcy
I second this and add, He may not have wanted you to know, he may have thought you would treat him different or tell people that he doesn't want it spread to, if this is the case try to get him to talk to you privately and be moral support, being bi or homosexual is as Marcy said can be difficult emotionally and physically with others attacking, just be a good friend.
The same as you should do if you were heterosexual and your friend was of the opposite gender, focus on your friendship and be a good friend.
your middle finger If your vagina is wide enough use two fingers(i suggest middle and index or middle and ring finger)(at once)
You should wear the Neeli gem on you middle finger. But the Neeli can only be worn on Saturday.
nothing is really bad about the middle finger i mean its just a finger i can stick up my pointer finger and will i get in trouble? NO! the middle finger is not bad and should not be bad.
tell her!(:
you have to hold the ball in your index finger and your middle finger then when throwing the ball your index finger should go down and the middle finger should go up your fingers should go to the left if you are right handed and to the right if left handed.
When someone points their middle finger at you it means that they are meaning to say f&#@ you or it means a boy's private if upside-down
diamonds should b worn on the middle finger or the little finger of either hand... preferably left for women
Your best friend who is bisexual has made a choice and it is not like being gay. As long as they do not come onto you or try to make you change to be what they are then this should not end your relationship. Sexual preferences are private as long as they do not harm anyone else so accept your friend for who they are and not what sexual preference they are.
you should move the other fingers forward and keep that finger forward and then tape it
Yes you should. He won't know what you think of him unless you tell him.
Put up your hand and keep your ring finger and pinkie finger together. Your middle finger, index finger, and your thumb should be together, keeping the two sets apart from each other. That's how you say hello in alien language. Put up your hand and keep your ring finger and your middle finger together. Your pinkie finger, index finger, and thumb should be extended from the ring and middle finger, leaving them alone in the middle. That's how you say goodbye in alien language. Much obliged for y'all listening! Say hi to all of your fellow Nepturians.