Forgiveness for a deep wound is not something we manufacture by sheer willpower, but a grace we receive as we learn to lean entirely on the One who makes all things new. Perhaps the first step is simply to acknowledge that this is beyond our own strength, and to bring that limitation to God without shame. The Catechism reminds us gently that our struggle often reveals where we still need to grow in trust: "The most frequent and most hidden temptation is our lack of faith. … Sometimes we turn to the Lord as a last resort; but do we really believe it? … In every case, our lack of faith reveals that we do not yet have the disposition of a humble heart: 'Without me you can do nothing'" [1].
It may comfort you to know that Jesus Himself faced the agony of betrayal and understood the cost of forgiveness from the inside. He did not ask us to walk a path He has not already walked, but He also showed us that what looks like loss can become the very source of life. As He said: "Amen, amen, I say to you, unless a grain of wheat falls to the ground and dies, it remains alone; but if it dies, it produces much fruit. Whoever loves his life loses it, and whoever hates his life in this world preserves it for eternal life" [2]. Forgiveness often feels like a kind of dying — a letting go of our right to hold the wound as leverage — yet it is precisely in that surrender that God brings healing and fruitfulness we could never achieve on our own.
You are not expected to understand every mystery of this process or to resolve it all at once. There is a blessed simplicity in simply trusting God’s word even when the feelings are not yet there. Thomas à Kempis counsels: "Blessed is the simplicity that leaves the difficult paths of questions and goes by the plain and firm way of God’s commandments. … Submit to God and humble your understanding to faith, and the light of knowledge will be given to you, insofar as it is useful and necessary for you" [4]. You do not need to have it all figured out to begin; you need only to take the next small step in faith, trusting that God’s mercy is already at work in you, even now.