Loving someone who doesn't love you back is hard. It's like a 'So near, yet so far' feeling. & you can see that he/she is head-over-heels for that person. And you, well there's nothing you can do. You love that person. But then that person loves someone else. & that 'someone' else is not you. & that heartbreak comes along, when you watch the one you love. Be happy. With someone else.