I am so sorry to read of your pain and loss. It is devastating to be hurt in this way and to realize that someone is not exactly the person you thought they were.The betrayal on facebook is just awful and speaks loudly of her true character. There are many ways to end a relationship with respect and dignity but she chose the opposite.
I want to tell you to look at yourself and your ability to love. That is a wonderful thing and don’t let this sour your heart with her bad behavior. We have no control over other’s decisions or actions but we CAN control our own. Pull yourself up and understand that you WILL love again! I promise you!