It seems to be the nature of the beast. Runaway egos ruin bands. I’ve hung on, in such situations, much longer than I should have. It can be a huge drain. Getting used to it, accepting it, can easily morph into an unhealthy co-dependency scenario. Best to bail once the toxic environment first becomes evident … which is immediately following a sit-down discussion of whatever ego/power trip sets off your BS-Detector. If it can’t be talked out, and resolved to mutual satisfaction … time to pack up and go.
Sorry to hear it didn’t work out. Something better will come along … or you, by force of will, are now in a position to MAKE something better.