I would write him an e-mail, explaining everything. In this way it's easier to make sure that your words are soft enough and your friendship will endure. Face-to-face it's easier for things to escalate.
One way to get rid of a player or players is to bring the current story arc to a close and tell everyone that's the end of the game. Then, after a brief hiatus, invite back olny the players you want for the next story arc.
If this fails, then again I would have the DM speak to the player (again, one-on-one and in person).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.