Love is an emotion, but it’s also a decision, a behavior, an idea, a stance, and an act. Some people fall out of love, but emotion is only part of it, belief is a more important part. If you treat each other in good faith and in a nurturing manner, love can blossom and rebolosom.
Make no mistake of illusion: My spouse can be a PITA and she can stress me out since I worry about her. But she has my heart.