This is the harsh reality of many modern marriages. Approximately 80 percent of those going into marriage expect total faithfulness, but less than 40 percent will actually have it. Roughly 60 percent of men and 40 percent of women in Western societies are unfaithful. If you sincerely give to one another in words and actions, love will continue to grow. Do not let your marriage drift.
Love is an art.
A few wrong brushstrokes need not ruin the canvas, though. Love can be regenerated. If you have never seen an example of this, spiritual resources are available to you. God is always there. He is still on his throne.