How can you move on quickly?

My girlfriend broke up with me just five days ago and damn, it was painful and still is. I know it would sound gay and maybe for some, it would sound silly that I cry almost every time because of the pain she left me but yes, I do. She was the one I truly love all these years and she broke up with me saying loving me is not worth it. Am I really not that worthy of love? I begged for her to come back but she does not want to. Right now, I just want to get rid of this pain and move on.