What does that mean?

Be my Valentine: What does that mean?
Each of us must walk through life alone,
More deeply desolate than we have known,
Yearning for a truth we""ve never seen.
Valentines are from beyond that dream,
Are like a sunrise on a world of stone.
Little on this journey can we own
Except as miracles might intervene.
No way but through loving might we give
The freedom of our being to another.
In such a sacrifice we hope to live
No longer bound by dreams of flesh and bone,
Even as we bind our lives together