Somebody posed a question and this was the answer he received from someone too. Probably a quote making its way from one hand to another but it certainly made its point very clear.
"Do you know why a Car's WINDSHIELD is so large & the REAR VIEW MIRROR is so small? ------ Because our PAST is not as important as our FUTURE. Look Ahead and Move on."
I like that answer. The past has done its job. We've learned and have been made wiser by it. Those parts which broke our heart have no part in the present nor in the future. There is no need in wanting to live the pain and hurt over and over again. No need to break your heart repeatedly by your own pitiful thoughts... and certainly no need for it to be brought along into the future; it will only clip your wings if your aim is to fly.
There is more to life than what you can conceive in your mind. The dreams of your heart are there to move you forward. And that is the only direction we are supposed to take.
Move on. Forward.