Well, we need to have the strength to move on. The courage and strength, of course. Without them, we won't be able to do anything about it. We also need help from other people, depending on the problem. Other than moving on, we have to take action. If you sit there moping about what happened, that won't solve your problem. Need more than that? Message me on my profile, I'd be happy to oblige.
:D Hope this helped! :D