I love you. That could be a physiological statement, saying that you produce in me a combination of hormones and adrenaline that tickles the deep recesses of the brain producing sweaty palms, fluttering heartbeats, insomnia, attention deficit, mood swings, loss of appetite. It could be a psychological statement, saying that I desire you, or I need you or I want to control or manipulate you or mold you, or get something from you. I love you so much, I can't live without you. That is love as idolatry.
Love is an attitude of the heart that is expressed in outward action.
The action most associated with the attitude of love is giving. To love is to put another in the path of your giving. It is to make the beloved the object of your sacrifice. God so loved the world that He gave. It means that I want to give you something that is precious to me, something of myself, and I want you to be on the receiving end of my giving.