Love is unconditional.
Love is not determined by the one being loved but rather by the one choosing to love.
Do something out of the ordinary today for your spouse, something that proves (to you and to them) that your love is based on your choice and nothing else. Wash your spouse's car. Clean the kitchen. Buy or make their favorite dessert. Fold the laundry. Demonstrate love to them for the sheer joy of being their partner in marriage.