I'm sorry you had to experience that, but he is the broken one, not you. You're human and put trust in someone with hopes that he would be true to his word. But he didn't and he can't so it's time to move on. Although painful, it's experience and you will be stronger for it and available when the right person who deserves your heart comes along.
You need to cut him out of your life completely. He blew his last chance. Move on and find peace again.