'Forgive us our trespasses as we forgive those who trespass against us', is a line from the Lord's Prayer. If you want to move forward, you must let go those that have hurt you and caused you pains in the past. The bitter truth is that you hurt yourself more when you don't forgive and that can likely limit you from achieving success in life.
On your journey to success, people must surely hurt you; they will offend you to make you lose focus on your goal. But will you allow that affect you? Just look at what they do to you and smile. Even Jesus Christ forgave the people he came to save after everything they did to him.
Learn to forgive and forget. Stay focus on your quest for success.