There is hope for your marriage because the greatest relational separation imaginable has already been reconciled. We were separated and estranged from God far more than we could be from any human relationship. Jesus has made forgiveness and reconciliation with God possible through faith in Him.
“Remember that you were at that time separated from Christ, alienated from the commonwealth of Israel and strangers to the covenants of promise, having no hope and without God in the world. But now in Christ Jesus you who once were far off have been brought near by the blood of Christ” (Eph. 2:12-13)