My view on this is rather unusual I think. To say "I love you" is like saying:
I commit myself to understanding who and why you are the way you are. I strip myself of the shackles of right and wrong, and look at you with fresh eyes. To see for myself the push and pull of events that have defined you. To see the choices you have made, and discern and distinguish between intent and failure relative to what you value. To understand what you value, what you fear, and why you have come to do so. To see the full extent of your personality in context and contrast to mine, that I might perhaps earn myself a place to say something of it, good or bad.
While conventional thought suggests that to love someone is to have already understood them enough to warrant said love, I see it more as an active and continued commitment to understanding. It is the hand reaching out to another, a request for a continued audience, a request for unfettered access to the depths of another. It is the difference between "I love him because—" and "I love him".
The degree to which we love is the degree to which we allow ourselves to experience the other wholeheartedly.
The niceties of today are meaningless without the understanding. "I care about you", "You are my friend", and all sayings alike are nothing more than selfish utterances when the you has no definition. It is more an expression of their own needs, and has little to nothing to do with you. The you in their statements is nothing more than incidental; you could have been anyone else if it fit their narrative. Love is a request to find the definition in you.
By this, I believe that I have never really been loved by anyone. I exist as nothing more than a fiction or fantasy that fits into the narratives that those around me live by.
I don't think I have truly loved anyone either.
I have a growing distaste, even disgust, for people who say such words without pause or hesitation. I find it to be inconsiderate, harmful, selfish, self-absorbed, insulting, burdensome, demanding, among many other things.