I don't understand why he got so "uppity" and said "Stop - we are done," etc. Why all the anger? What was that all about? Did you have a huge fight when he said it wasn't going to work?
I'm sorry this happened. I really am. But being broken-hearted over a man has never killed anyone -- and I'm NOT minimizing your pain, believe me.

I know it hurts, and it hurts BAD. You can't sleep, he occupies your mind all day, it's all you can think of, you can't concentrate on anything, etc. It's miserable!
But like everyone says and is going to say, time does heal -- and it's going to take time for THIS to heal. It's unfortunate that you live so close now, so that you see him and his car so frequently -- but that can't be helped right now. If, at a later date, you CAN find a place somewhere else, that would be to your benefit. In the meantime, try to keep busy. Try to keep your mind occupied. Try not to look towards his house -- if you have a window that you frequently look out to check on him, put something in front of it so you can't see out of it easily.
I'm sure you'll find someone who DESERVES you - someone who is compassionate, kind, loving and caring. I wish you the very best -- please take good care of yourself and your son. God bless. Hugs, Lee