Signs you may be struggling with bitterness:
You have imaginary conversations
You replay a conversation or experience over and over in your head
You feel the need to tell someone what he/she did
You are easily offended by this person
You have strong negative emotional reactions to things they say and do around you
You can remember details of things he/she said from months or years ago
You are keeping a list of offenses
How to break the cycle of bitterness:
Cast down your imaginations.
Ask God to help you forgive the pain that was caused towards you.
Forgive the person who hurt you.
Avoid the conversation about it with others.