You can do it.

The only way you can heal the pain of a hurt that you have been nursing caused by unforgiveness is to forgive the person who initiated the hurt.

Hurting is a way people deal with forgiveness, hurt leads to hatred but forgiveness clean it all.

Matthew6:14-15" if you forgive others the wrongs they have done to you, your father in Heaven will also forgive you. But if you do not forgive others, then your father will not forgive the wrongs you have done".

Are you so hurt and bittered? Forgive the person now.
You can do it.