Great article about an important concept, one more couples need to understand.
Only thing I disagree with here is your assertion that love is a feeling. Love is a commitment to the other's welfare, and the actions and choices you make because of that commitment.
Feelings of fascination, admiration, desire, affection, etc. will come and go, just because they are biochemical events that cannot be sustained indefinitely. You are going to wake up now and then and wonder if you really want this person occupying so much of your life. But your commitment (love) will tell you to get up and make the coffee for you both.
But you're absolutely right--when the other betrays your trust, it's going to make you question your commitment in a different way.