You can't move forward without coming to terms with your past.

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1. Don't live in the past learn from it.

What happened?
How did you feel?
How can you use that experience to your advantage and make a better future for yourself?

2. Get it off your chest.

Write it down.
Talk to someone you trust about it.
Just get it out there.

3. Stop seeing yourself as the victim.

Playing the victim will get you nowhere.
By blaming someone else you are just giving them power over your life.
Do you really want to give that kind of power away?

4. Focus on the present.

Instead of reliving the past start being more mindful about the present.
Some things that might help you with this are meditation and exercise.
Learn to live with your thoughts, they are just that thoughts.