You have an expectation of how a certain situation should be and you have put in the necessary work. Through no fault of your own or factors beyond your control, your expectation does not attain realization. Now what?
There will be times when "It is what it is." is the only answer. Acceptance is definitely not easy. There are times, however, when there is no other option. We may have an expectation that was unrealistic from the beginning, or there may have been an extreme change in circumstances that rendered it unattainable.
Acceptance allows time to grieve the loss of a dream, hope, or expectation. It does not allow for the unending complaining and bewailing of a dream lost. To dwell on what might have been is to rob the present of its joy and the future of its possibility.
It did not work out the way you planned. Unfortunately, life happens. It is up to you to accept, move on, and move up!