It's natural to be angry when you've gotten the raw end of the deal and when someone has mistreated you. You may feel angry or bitter for a while. Do you ever journal? I found that journaling and letting my feelings out on paper to myself really helps. Or let it all out here. It's healthy to acknowledge your feelings and to let it out. After a while of feeling that way, you will move onto another stage.... most likely acceptance and moving on from what happened. Just know in your heart and mind that you do deserve better treatment than that. It's one way to heal and move forward, is to know that you would never accept less than what you truly want and how you want to feel in a relationship. And one should mainly feel good in a relationship, not depressed, bad about oneself and unhappy.