Everyone has different ways of forgetting, coping with and dealing with certain parts of our pasts. Honestly, you can't erase past memories completely. Everything that happens to you makes up who you are, you wouldn't be yourself if you were missing even one memory. Especially if they're bad memories and parts of a past, life is just built like that. Everyone struggles, everyone hurts, just differently. Pain shapes you. For me, I've never really thought about how to forget because that's impossible. I just dwell on those parts when the time comes for it, I feel sad or angry or whatever I feel during that time, allow myself to feel that way, and keep moving on. I think the parts of my life I want to forget the most are the important events that make me who I am today. Even if I could forget, I wouldn't because in life, you're meant to learn. You can't run from yourself or your experiences. I think if it was made impossible to forget such events, it's for a reason and all you can do is learn and take it with you in the next chapters of your life.