Connection is a mysterious thing. No doubt there is far more to it than we are aware of. I agree... I don't think we'll ever understand it.
I am sure you will find connection again with someone else, and perhaps next time it will be even more incredible because you will be connected in even more ways. That has been my experience. I lost someone I thought was "the one" but now I am with someone who is a trillion times more right for me. And this connection is magic!