Because you know you will spend the rest of your life making it up to her. Because she deserves it. She endured your worst and now deserves your best. You know that she will be the same with you. And you will give her your life, your every breath. Hoped that these things will make you somehow worthy of her forgiveness. Love her with everything that you have but do not try to change or own her. She is capable of living without you but chose to love you instead.