Yo Kass answered
The person that will know how to best tell your closest friend about your bisexuality is you! You are best friends for a reason - and only you can truly know how he/she is going to react.
However, I'd recommend you take into consideration the following points:
Your best friend may feel confused. Don't be shocked by this. You think you now someone inside out, and then all of a sudden it turns out there's this big secret they weren't even aware of.
Don't pay too much attention to your friend's initial reaction (whether negative or positive), their true feelings on the matter will make themselves evident after some careful reflection.
Where you tell your friend matters. Pick the place where you break the news carefully. If it's somewhere too intimate, he or she may assume you're coming on to them.
Do it in somewhere too public and your friend might feel uncomfortable discussing your sexuality with 10 other people eavesdropping.
Stay proud and strong. Your sexuality is something you should be proud of. True friends will support you, regardless of how they feel about your sexual preferences.
If you're worried that you'll loose all your friends when you come out as bi, you only need to look towards all the bi and gay people out there that have super-active social lives full of great friends and companions.
If your friend's really can't accept your sexuality, then I'm of the opinion that they're not friends worth having in the first place.
However, I'd recommend you take into consideration the following points:
Your best friend may feel confused. Don't be shocked by this. You think you now someone inside out, and then all of a sudden it turns out there's this big secret they weren't even aware of.
Don't pay too much attention to your friend's initial reaction (whether negative or positive), their true feelings on the matter will make themselves evident after some careful reflection.
Where you tell your friend matters. Pick the place where you break the news carefully. If it's somewhere too intimate, he or she may assume you're coming on to them.
Do it in somewhere too public and your friend might feel uncomfortable discussing your sexuality with 10 other people eavesdropping.
Stay proud and strong. Your sexuality is something you should be proud of. True friends will support you, regardless of how they feel about your sexual preferences.
If you're worried that you'll loose all your friends when you come out as bi, you only need to look towards all the bi and gay people out there that have super-active social lives full of great friends and companions.
If your friend's really can't accept your sexuality, then I'm of the opinion that they're not friends worth having in the first place.