I need to tell you LuLu, that it is all in the way you look at it. I know where you are coming from, believing all this you believe and feeling so badly about it, and letting it tear up your heart and your life, but in my opinion, the ONLY reason he is gone and gone with another woman is because YOU WERE FINISHED WITH HIM. There doesn't even exist anything or anyone "better" than you, you make that all up in your head. We are ALL equal in worth.
You were done with him LuLu, LONG ago. You are just taking a while to catch up to that decision. Now you are speeding up the process. Good for you for settling into your decision. Stick with it.