Don't ever worry about being heartbroken by the limitations of human beings. They will always exist, and if your ability to love depends on overcoming those limitations, you will never be free to love, you will never be free to share what is truly in your own heart. Your own limitations and the limitations of others define so much of relationship, but not necessarily so much of your capacity to love.
G*d has made us to love. He has made us to feel the highest calling in loving and being loved. Do not be careless with love. Do not confuse other emotions for love. Do not be tricked into accepting things that look and feel like love but are not.
But when you feel love, share it with joy and acceptance and kindness and authenticity. Accept its power as it moves through you and spills out into the world. It can change you in ways you never imagined, and build bridges to those you never knew you could reach.
Love doesn't make you weak. Real love strengthens your heart. It is only in parsing it out with too many strings that its power is lost. It is only in confusing love with the specific dynamics of relationship that its power is lost. It is only in mistaking your own needs for love itself that its power is lost. Accept love. From G*d. From others. From all the places you experience it. And share it back in full force.
It will be your power. Your liberation. Your key to yourself. And if this love is for a specific person, and if the relationship doesn't bear the fruit you expected, the power of that love will live on inside of you anyway, and nourish your soul even in the midst of sorrow or disappointment.
Do not reject the offer that love brings, to soar higher than you imagined, to dive deeper than you thought possible, to taste the sweet juiciness that life contains. Do not let fear be bigger than love.