I really tried not to. I told him that he needed to accept responsibility for his negligence and to apologize to me, but he didn't. Actually, he texted my later that night after the gig and told me that he has "a bassist lined up that doesn't **** around on bar gigs when his (my guitarist's) name is on the line, and that I can't just show up to a gig whenever I feel like it." I told him he was acting like a spoiled brat.
Quit the band