A, what he means is to turn around and choose to forget and look forward. He doesn't want to look back. No matter whether he broke up deeply in his past feelings or not, he will never look back. Even though he is still very sad and can't let go of his girlfriend, he will definitely get through this period and let himself come out as soon as possible. Time is an excellent thing that can make you forget who you used to be. You should encourage him, accompany him and help him get out as soon as possible.