This would be in the context of a romantic relationship/partnership. My overarching view of this is that I feel like in our times and culture those words have become very cheap. Seeing people treat each other like total garbage and try to put a band-aid on things by saying the magic words. Can love not be expressed by your actions, your nature, and your respect towards another person? I know when someone loves me, they don’t have to tell me also.
It is true that some people lie. And love is expressed by your actions and behavior too.
But that does not mean saying ‘I love you’ is always useless.
People like hearing reassurance. Saying ‘I love you’ when you mean it makes your partner happier too. Express your love in all possible ways.