How to say sorry to a innocent girl whose heart was broken by me so that she would forgive me?

Sorry is the last thing she wants to hear, put yourself in her shoes I'm sure you won't wanna be near the person who caused you to even consider suicide. She's over you and is on a path without you so just let her be and learn from your mistake with another girl. She's trying to get herself together and when you keep trying to contact her you're making her take 3 steps back instead of 1 forward.