We are only human and being thus, we feel. We feel the pain of love lost, we feel the pain of love unrequited, and for some of us, we feel the pain so much that we understand the hurt a person has in his heart to make him climb over a ledge - and jump.
Perhaps it be good that we could just forget a love by defeating our sense of worth and submit that love is beyond our control; that it is a harsh reality of life. But I cannot and, though it hurts so, I am glad of it. Otherwise, love would be just one more corporeal object of life, rather than the enigmatic and wondrous mystery that it really is - gossamer wings, angel hair, soft sunshine.
I cannot because I feel.
If you keep your heart open, it might come again. But it would not be the same - the way you look at life, the way you look at love, the way you look at yourself. It would never be the same.
Learn not to procrastinate the matters of the heart, for eventually, it will come back to haunt you with icy fingers. Instead, learn to feel, learn to cry, learn to embrace and to accept it...
Then learn to love yourself.