Pain is a part of life.  Do what you can to lessen it, but once you are hurt by someone, divide the pain to get the most out of the experience.

Some of the pain was bad luck - you could not have avoided it.  Just accept that life contains bad luck.

Don't bury how you feel about what happened - acknowledge your emotions.  They're real and they matter.

Some of the pain was your mistake - learn from it, and do better.

Once you've done this and have processed what happened, has the experience opened some doors for you?