Knowing who you are fighting against is half the battle. Your battle is not against your family member, your old friend, the girl at work, the guy in the grocery store, your landlord, your boss, or your ex.
Your battle is against the devil, and your battle is spiritual.
Do you know what your greatest weapon is? Prayer.
Pray for the people who hurt you. Pray for the people who used you. Pray for the people who gossiped about you. Pray for the people who stole from you. Pray for the people who lied to you. Pray for the people who broke your heart.
The enemy wants division. He wants you to be angry. He wants you to live in unforgiveness. God calls you to love your enemies and pray for those who persecute you. Besides, you never know what battles your enemies might be fighting.