What does it mean to truly let something be?

I feel like I am in love with someone, but she doesn’t agree, so I am grasping with my mind and heart every few hours.

What would it mean for me to truly let it be?

Is it the conceptual understanding? Of mindfully observing the grasping thoughts, and watching them float away? And is it also the energetics? Unpleasant feeling of loss and discontent comes up from the belly through the chest, wanting to move the heart and the limbs and the mouth towards the actions that can possess her, and you feel and watch and breathe as it passes, and do nothing else.

And is there a level of letting it be, that is yet deeper?

A level so deep that you are no longer letting it be. You are one with the it. The universe penetrates fully in through the skin, closer and closer towards the core, burning it all off, until it reaches the center and vanquishes it, and there is no self left. It is all the outside.

Maybe there is not even an energy or thought of resistance to the happening that arises any more, perhaps even a divine bliss in the happening of things?

Or is that too much to ask? My heart trembles in fear at the thought of it. How can I be content with anything that happens?