Once I was the only "indispensable" developer too. Also under a bad managing owner. When I left I offered to help in time of a crisis. Never heard of him again.

Once I was the only "indispensable" developer too. Also under a bad managing owner. When I left I offered to help in time of a crisis. Never heard of him again. Ask yourself this: do you get paid for the risk of you leaving? And ask yourself this: can your family enjoy you when you feel bad?