Imagine if you will, you're in a show and it's about two weeks from opening night. You and your castmates are off-book, the set is almost finished and you're ready for tech week, then disaster strikes, one of your castmates drops out of the show.
Not because of an injury or serious illness. Not because of a death in the family or emergency forcing them to leave the state. No, your fellow cast member dropped out because their fragile ego was hurt and rather than stick it out, they quit. Quit the production and more importantly, quit on you.