Hi B,

Maybe you need to focus on why you would allow someone to treat you as an option. Instead of focusing on trying to understand him you should take the time to understand yourself. Why would you let someone who cheats and lies return back to your life? What is it about you that makes you crave the attention from someone who discards you. You will learn a lot more and hopefully find some wisdom by focusing on yourself, rather than trying to understand the actions of your ex.

Good luck