No, I would never do such a cruel thing to one I hold very dear to my heart. Friendship should never be thrown away for such selfish reasons. What would be the point of living forever without your best friend? Sure, you think you could get a new best friend, but great friendships take time, trust, love, and anything else related to those subjects. Every friendship you make with someone should be considered very special to you. With friendships, you know that you have a bond with someone, so is it really worth it for a bond to be thrown away for selfish needs? Also could you really live with such a burden of killing your best friend? I know I never could.