It is a verb; not just a noun.

It is something you do, not just something you feel.

Love. It’s a verb. You can have feelings that you define as love, but you do not “love someone” until you act on that, and put them before yourself: their happiness, well-being, etc. You should apply this to the people who claim they love you but don’t act like it. Words mean next to nothing unless they are backed with action.