Oh...God...Letting go meant you accepted what couldn't be changed. You didn't try to hold on to hope in order to coerce a change in fortune...nor did you battle against the superior forces of fate and try to make them capitulate to your will...nor did you beg for salvation because you assumed you knew better. Letting go meant you stared at what was before you with clear eyes, recognizing that unfettered choice was the exception and destiny the rule.
No bargaining. No trying to control. You gave up and saw that the one you loved was in fact not your future, and there ws nothing you could do about it.