I was sacked last year by a band I was a founder member of after 4 years together - one of two bands I was in at the time. But rather than being upset or angry I found it to be quite a relief when it happened as I had been getting increasingly pissed off with the singer, who over the 4 years had gradually become a complete prima donna. I'd had a gutful and was contemplating leaving but when do you decide to jump ship? Difficult call but in the end the decision was taken out of my hands when we had a rather silly finger wagging barney just before a gig (As I recall I threatened to chuck him off the fire escape) after which he said 'him or me'. The other guys chose him, as he is a rather good front man and I am 'just the bass player'. They haven't found anyone to replace me yet, which gives me a small amount of satisfaction.
I have moved on and am back to being in two bands, with a third in the offing. Things work out in the end.