My best friend, guitarist and BL who I have known for over 20 years, has always been a little eccentric. As a child he was diagnosed as Bipolar with manic depression. He's always been a little over the top at our shows. I love the guy like a brother but lately his behavior has become a little more than just over the top. Hes always had a problem with volume (like most guitarist). Most of the time after bringing it to his attention he would reluctantly bring it down. Two weekends ago at our last gig, he went over board and had the volume at an obnoxiously loud level. After a few complaints from people in the crowd, he gets on the mic and tell the crowd to "F'n deal with it". The rest of us in the band were completely in shock, but not surprised. Throughout the set he was forgetting lyrics, he was forgetting where he was in the song, extending his solos way beyond their normal time, and using the wrong effects for the wrong songs (mind you that there was no drugs or alcohol present). This has always been a small issue but lately it seems to be getting worse. After the show was over, I was so upset that I told him I was done, and stormed out. I next day I get a call from him, and hes obviously distraught. He starts telling me that he needs the band and that without us his life has no meaning. I told him that Id always be his friend but I couldn't guarantee that I'd be could be his bass player any longer. He promised that he would try to work on his outburst. I told him i'd have to think about it. This guy has never been able to hold down a job and the gigs are pretty much his main source of income. The rest of the band (Me, another guitarist, and a drummer) are full time working guys. We usually give all the gig money to him, and really just end up doing it for fun, and to help him out. I feel a bit obligated to stick around because before my brother and the drummer it was just me and him jamming open mic, friends parties and other small venues. I have always told him that I would do this to help him get his music out. He's a hell of a guitarist and song writer. The music we're playing now is 15 years in the making, and i'm finding it very hard to let it go. I also feel bad that I brought my brother into the band, cause now he and the drummer almost see it as my fault the band is breaking up. I feel like i'm letting everyone down. I feel like i'm losing my best friend to his mental illness. Has anyone ever dealt with a similar situation? Damn, I just dont know what to do.