Every day you hear or read of someone "falling in or out of love." A mystical compelling thing that happens to people. They have no power over it. It just happens. If they "fall out of love" it becomes a rational reason to divorce.
Nonsense. Love is a verb, something you do or do not do. You can decide to love someone to whom you feel a strong attraction or you can decide not to love. The feeling we ascribe to love is the consequence of what we do.
In any long-term relationship there are times when you will not feel loved or loving. Those are the critical times in a long-term relationship. If at that time you decide to love, the feelings we associate with love, will come back stronger and at a deeper level.
Over a long period of time deciding to love when you don't feel loving will lead to the ultimate act of love, complete acceptance of the other person despite characteristics that may be irritating. A person can never receive or give a greater gift!