You don’t have to wait until you lose contacts with someone or until the person is off the face of this earth before you realise to say “I love you” to them. If you love someone, tell them for whatever reason it may be. I see the words “I love you” as a form of appreciation, it makes me feel happy inside that someone deeply regards me.
Say “I love you” to whom “I love you” is due, some people lived their lives with the thought that no one ever loved them simply because they never heard the words or even read it in form of a text.
Make it a habit, make it a greeting if possible.
Start and end your day with love.