Seuss definition of love: We're all a little weird, and life's a little weird. And when we find someone whose weirdness is compatible with ours, we join up with them and fall in mutual weirdness and call it LOVE. I love this!
I don't agree that this is the "one law" for relationships, but I DO think you should never make the person you're with feel lonely, especially when you are there. One of the worst feelings in my opinion.