An active noun

The gentlest man ever to be on television did not think love was gentle. He thought it was work, done every day, by people who mostly do not feel like it at the time.

The feeling comes and goes. It always will. The thing you can actually promise someone is the doing.

So if you want to know whether someone loves you, do not ask how they feel. Watch what they do at eleven at night when it is inconvenient.