Do your friends influence...?

Do your friends have any friends that you're attracted to but don't want to explore a further relationship with 'cause of your friends influence?

I've been there before. A good friend of mine introduced me to his best friend. I was imidiately attracted to him but it his best friend? I though if anything should happen and it went bad, I would be afraid of losing my friend. The old saying is true, guys come and go but friends are forever.