i have to catch myself from doing this sometimes to the most random of people.. it is a good habit to get into but when the person hearing it isn't expecting it, man!, can it bring turmoil :)
I have done the very same thing, with certain special ones close to my heart... and have listened over and over until I could almost sware I hear an, 'I love you'.... amazing how the mind works, yeah??? thanks for sharing...;-)