First, I tell her that she can't fire me because I quit. Then I tell her I was banging her friends anyway. Or at least that I had been screwing around the whole time. I smoke a blunt and I laugh at HER thinking of all she is missing out on. Then I tell all of my friends that she was a slut. Kind of childish, but I don't care. Afterwards, I delete her # from my phone, and ignore the fact that she exists or ever existed from that point on. If she calls me to ask how I'm doing, I'll tell her she must have the wrong number. If she stops by my house, I'll answer the door and say something about "damn neighbor kids door ditchin sonofa***** grumble grumble yadda" and walk back inside.
In the mean time, I call one of the plates that I had already been spinning (important lesson here guys), and get some head to ease the pain.