Heather,

You do have power, more power than you know. You don't have to act on impulse. You can slow it down, breathe, pause, and think about how you are going to respond--instead of react.

That is where your power is. You don't have control over how he treats you, of if he meets his responsibilities-- that's in his box. But you do have control over how you respond. That's in your box.