The philosophical issue of friendship has been important since ancient times, and while there are humans there will be need of friends. These are unique characters, these persons so similar and dissimilar to us. They are at first sometimes annoyances, and later the closest of friends. Siblings have in their relationship a touch of friendship, as Apollo and Hermes knew. Those two fought so that one might gain ascendancy to the level of the most-honored gods. Their brawl ended when they exchanged gifts, and they lived in peace and comfort together since that time. It was the conflict that carried the friendship, the breaking of boundary that made them close, horse theft notwithstanding.
And then there is you...