Before the cross we see this:
For if you forgive others their trespasses, your heavenly Father will also forgive you, Matt 6:14 ESV
While God definitely wants us to forgive others, primarily for our own benefit, these verses tell us something happened at the cross. Our forgiveness from God is no longer predicated on forgiving others.
After the cross we see this:
Be kind and compassionate to one another, forgiving each other, just as in Christ God forgave you. Eph 4:32
Bear with each other and forgive one another if any of you has a grievance against someone. Forgive as the Lord forgave you. Col 3:13
The cross is about God’s love for us and really made a difference. When we are rooted and grounded in His love, we are empowered to forgive others as we have been forgiven.
but God shows his love for us in that while we were still sinners, Christ died for us. Rom 5:8
We love because he first loved us. 1 John 4:19Read more about God's love, grace, mercy and forgiveness for you HERE.