I read up a lot on what happened, since I was just discoverying the band just after they parted ways. I read just about everything the band, Tarja, and even Marcelo had to say on the subject. My take on it is that the relationship deteriorated as a result of the band, Tarja, Marcelo, and management, who seems to have actively fanned the flames. There is plenty of blame to be shared by all. When you get to the place where the band's existence is threatened, Tuomas simply cannot deal with either Tarja or Marcelo on the most basic of decisions, Tarja and Marcelo feel as though their marriage is threatened, Tarja has announced that she is only staying on for one more album after that one and leaving anyway, and management is fanning the flames, I just can't see how you don't have to part ways at that point in time.