I don't think the OP's boss is necessarily a dick. The OP may be putting the pressure on himself (he is a co-founder). But my point is, no company needs you to

I don't think the OP's boss is necessarily a dick. The OP may be putting the pressure on himself (he is a co-founder). But my point is, no company needs you to be give 100%. Ever. Even if you are the only person who can do your job.