Dave
IMO tell this guy it's just not working for you and bow out if he asks why then go further, if the "boss" asks why then go further.

I think you will cut your own throat to become known as one of the two in that crappy duo.

I do not think you can win by going to the boss....he doesn't want to know that crap, nor really is it his biz anyway. That's a no win situation,the drummer will bad mouth you to everyone saying you tried to steal the gig from him, the boss will off you both for being more hassle than you're worth.

I think if you tell the boss anything it should just be that a duo does not work for you, so that's why you won't be performing with the other guy again, you're a solo act and should he ever need someone else to keep you in mind.
Terry

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jam on,
Terry http://imjazzed.homestead.com/Index.html