Imagine!! You are in the Pyramid and there are many secret doors. Inside one door, you found the bags full of gold. When you got inside the door, the door started closing. Now you have two choices, either leave the bag and exit to explore new things or stick with the bag and stuck in one place forever. What will you do in that case?
Well that's just an imagination. But in real life, it happens too, but in a different way. Instead of bag full of gold, it's full of memories, past memories. You got some, I got some, every person has some kind of history, or "baggage", although at varying levels. Carrying baggage of the past is the burden for your present. You cannot ruin your present because of past. Past is gone and neither you can change it or neither there is any benefit remembering it. But is it easy to forget the past? The pain, heart break, broken relationship that you have gone through. Well, it won't be easy, but it won't be good either to stuck up in one place and keep hurting yourself thinking about the past. You have got your whole life ahead.
It's hard to forget everything instantly. Give yourself time to jump into a new relationship. Indulge yourself into things you have never done and always wanted to do. There is a saying "Idle mind is a devils workshop". When you have nothing to do then you keep remembering your past and it will make your life miserable and will make hard for you to start over again. So keep yourself busy as it helps to heal you fast.
Learn from the past and come out a better and stronger person. This allows you to step into a new relationship with better knowledge of what not to be. Leave the past baggage behind, focus on today, and look forward to tomorrow.