I must admit, you made me smile. If the answer were so simple then we would not have Romeo and Juliet, Cleopatra, David and Bathsheba, Richard Burton and Elizabeth Taylor...you get the picture, at least for romantic love.
Compassion and love are synonymous. One cannot be pure and perfect without the other, hence one is tested on the synthesis of both together, again and again, until the two are merged and one no longer thinks of either concept. The person has become it.
It is the hardest test of it all, yes, including the comprehensive exams for higher degrees.