If it is true that what doesn't kill you makes you stronger by the time I get through this I will be Xena Warrior Princess!
If you waste time focusing on what you have left behind then you will miss the road that shows you what lies ahead.
Move on. It is just a chapter in the past, but don't close the book- just turn the page.
Though no one can go back and make a brand new start, anyone can start from now and make a brand new ending.