Meaning

"I love you" means that I accept you for the person you are, and that I do not wish to change you into someone else. It means that I will love you stand by you even throught the worst of times. It means loving you even when you're in a bad mood, or tired to do the things I want. It means loving you when you're down, not just when you're fun to be with.
"I love you" means that I know your deepest secrets and do not judge you for them, asking in return that you do not judge me for mine. It means that I care enough to fight for what we have and that I love you enough not to let you go. It means thinking of you, dreaming of you, wanting and needing you constantly.
It means that even though you don't know I feel this way I hope you do it too.