Forgiveness is not easy, especially toward someone who hurt you personally and deeply.
People who do such things are not following Christ's words.
However, on our part, we need to learn to forgive everyday.
When Jesus gave us a model for prayer, He taught us to pray everyday:
"And forgive us our debts, as we also have forgiven our debtors." (Matthew 6:12)
It is very important to forgive other people no matter what they have done, because Jesus goes on to say:
"For if you forgive others for their transgressions, your heavenly Father will also forgive you. But if you do not forgive others, then your Father will not forgive your transgressions." (Matthew 6:14-15)
Jesus even taught a parable on forgiveness.
Please see Matthew 18:21-35: https://www.bible.com/bible/100/MAT.18.NASB1995
So it is very important to forgive others. As you make a decision to forgive others, you can also ask God to help you forgive.
As long as you are willing to forgive, God will help you do it. And you will only begin to heal when you start to forgive.