When someone else's happiness is your happiness, that is love ! To me That is a BDSM relationship! It is those that love us that don't care what makes us happy! Our happiness is theirs! Enough said here!
Careful. This is true, both for better and for worse. Here again, it's necessary to distinguish between "nice," and "good." Reducing love to an emotion or sentiment is a trap, because it can't make those distinctions. Assessing what is good requires objectivity, which in itself requires both faith and reason.