I once had a hard time forgiving others. while in prayer one day the Lord spoke to my heart with this question..."How would you feel if I did not forgiven you when you were wanting out of your sinful life?
don't look into your own heart for forgiveness, look into mine."
I can now forgive very easily. I forgive (not because I think the person deserves it) but simply becaused Jesus asked me to.
Praying for you. God be with you and keep you.