They did you wrong.

Sometimes people just do us wrong, it happens, but it's not our fault that they do not know what loyalty is. So why carry all the burden of their mistake? Feeling betrayed is one thing, but to allow them to stir up your negative emotions is another. Let them go and yes, you might be alone afterward, but ask yourself this: Do you honestly need a person who would betray you and not give it a second thought in your life?