How Do I Leave?

I have been involved with a man for 12 years now. He was married for 10 of those years and is now divorced. We still have sexual relations but he will not give me a commitment. Even though I revolve my entire life around him I am very emotionally distraught. I cry all day long and wonder where he is and who else he is being intimate with. I've shut out everything in my life and can't move on. My only hope to survive is to leave this man. So my question is, "How do you face reality that this man will never love you and how do you move on without falling into a deep depression?"

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