Moving on from a breakup is never easy, you have spent so much time with that person and there are some beautiful memories that you two created together and after a breakup everything seems to be reminiscent of her and her little acts that made you smile, and when you realize that it is all over and it will never be back like it used to be then it brings so many emotions and you feel you will never recover from this, but there are some methods that are recommended by the experts which are really helpful in completely forgetting about your ex-girlfriend, before you jump to any conclusions or start doubting these know that these will take some time and you would have to patiently follow the guidelines.
The first thing you should do after a break up is not contact her and make it a priority to first heal yourself, that you would not be done by drowning yourself in sorrow, though you should be mature enough to realize your mistakes and take responsibility for it, there is no point in living in a state of grief and guilt, when you do that you only place the blame on yourself and ignore their mistakes that is opposite of what you should do, rather you should think about how they hurt you and why you deserve better, if you were truthful and wanted good for her and you still got the worse, you havea everything to be forget her, use that as a tool to forget her and become a better version of yourself.
If it is all over and you know you were wronged then there is no point in thinking about the past, rather look ahead, plan a trip with your friends and move on.