Forgiveness is it for us or for the person that offended us? Forgiveness is for both. The bible say In Matthew 6:12 Forgive us our debts, as we also have forgiven our debtors. What this verse is saying  is father I will forgive those that hurt me because you have forgiven me of my sin.

How simply is that but how hard is it for some of us?

The big picture is we need to let it go, I know its hard and unfair. Release it from your heart and allow God to heal you and He will take care of it for you. He will fight your battles. Your only, priority at that moment is to heal and the only person that can truly heal you is God Almighty.

It won't be easy, nothing is easy in this life. they have an old saying you have to crawl before you walk. make up in you mine that you want to forgive and in baby steps release the angry and bitterness that's in you. Your the one that's carrying this stress of unforgiveness and for what.

“Jesus said, ‘Father, forgive them, for they do not know what they are doing.’ And they divided up his clothes by casting lots” (Luke 23:34).

The day He died for our sin. He paid it all, he went to the slaughter house for us. Our sin and wrath were forgiven. It was separated from us as far as the east is from the west, it was no more.

Decide within yourself to forgive and love, let go of contention and stress. Release yourself from negativity and abnormality because that's what all of this is. Your body was not created to carry all of this baggage.

Here's some scripture verses on forgiveness

Matthew 6 vs. 14-15
1 John 1vs. 9
Acts 3 vs. 19
Isaiah 1vs.18
Daniel 9 vs. 9

There's so many more scriptures you can find on forgiveness. Search the word of God for yourself and seek out all there is to find.

Blessings