Thoughts lead to imaginations.  What is an imagination?  It is a thought put into action.  Good thoughts become good actions.  Bad thoughts become bad actions.  What am I saying?  If you have had a bad relationship and you feel that you were betrayed, there are thoughts that come into you mind concerning the situation.  You have two options.  You can meditate on them, hold them in your mind, let them continue to cause you grief, or you can cast them away and go on with life.  Casting away is the answer, but it is not easy.  You must have a strong desire to be free from the past.  That is when you go to God in prayer and ask Him to help you.   He will hear your cry for help.  He loves you.