I'm in a band where one of the members is a bit like this. He'll take any old gig, never paid gigs, and always put loads of pressure on to fulfil them, and to get recordings/artwork etc done RIGHT NOW. I'm trying to get my recording studio off the ground, so it's very important to me. I recently postponed a recording session because he'd sent me a load of characteristically sh*tty texts, pressuring me to do so, just for another unpaid gig. I found out a few days later that we'd not got the gig, but he didn't let me know and didn't apologise!!!!
If I asked BC for advice I'm sure you'd all say this is awful and I need to leave, but the fact is this band is a hell of a lot of fun, so I just put it to the back of my mind and have a good time