... Because I think I virtually never say it
I show them a lot - we are very tactile, do lots of kisses and hugs and cuddles. But I never say "I love you" to them (and neither does dh, incidentally). I am confident that they are secure in our love for them, but ... does that make me unusual? I have to say the thought of saying "I love you" to them leaves me a little uncomfortable, don't know why.