I remember telling someone, on her porch one afternoon: "That's because you have never really had your heart broken, and I will do my best so it never is."
Although I consider the promise was kept, it's easy to falter and maybe believe an impeccable heart to be an unwanted gift. There is a story of an old man whose' wounded, grieving heart he would not trade for that of a boy. A beautifully intact heart which was so naively boasted through the town; the story ends with the boy giving the old man a piece of the suddenly incomplete organ, and is an analogy of giving one's self in love.
In that boys eyes, and specially in these times, Love is a sentiment too often confused with desire, and self-adorement (narcissism), so the phrase: 'you must loose something to understand its real worth' urges one to believe a heart must be broken / given before one can understand its value, yet I believe in empathy. Time has bestowed upon life an infinitely powerful tool of comprehension, of understanding reality not only though our own eyes, but from those around us, of allowing us to share the responsibility of a better world.
It could be argued, that empathy is the root emotion behind the search for Justice (in another post, I quote a French philosopher who state Justice is an invention of man, and as such a responsibility of man unto himself.) So, if Love is a sentiment to be put to good use it must be born though Empathy, Comprehension, Dedication, Patience and Understanding, it must be a sentiment of Sharing, of reciprocal Trust and Cooperative Growth.
I recently heard a song: "What is love without lust" (La Roux - In For The Kill) and its something little short of coming from the black bible and a willingness to over-weigh self-adulation, self-fulfillment above all other things.
In that sense, and living through heart-breaks myself, there will always be choices in life. Choosing to be heart broken, is just as selfish as choosing lust. Evolution has seen to it so that our empathy, and sense of justice, prohibit us from attaining happiness if not through what we have identified as the virtues of life.