Some times as life goes on people drift apart. They forget all the pluses and focus on minuses. The warmth and closeness, two pulling together against the ups and downs of life. One starts to remember the down times more so then not. The phrase "I love you" begins to fade away.
After awhile, it seems to take some effort. The words seem hollow and then they stop all together. Love does matter, but has to be nurtured, like a flower, paid attention to it, not left alone. Then it will wither and die. People move on in life. What was important, what was once shared is no more.
So take care my friend, or the two together will be two alone.