My man Nerdy, we can spend forever asking questions about love but we can hardly have definite answers. Why is this so? Love is the most ancient of all mysteries which the mind cannot comprehend with certain exactitude. My definition may not be similar with yours, or yours may not be similar with mine ... ad infinitum. Love, ever since time immemorial, remains a mystery waiting to be unveiled by individual experiences. You can never really define it, because to define LOVE is to limit it.
The only concrete definition of love though, is that it's a zero score in tennis. =)