Cheated on her. I realise i shouldnt done it and I’ve broken her heart but I’ve changed and I’m willing to dedicate my life making her as happy as she makes me

I was a horrible person and I need a little time to show her this but for her to see this I need to do some action show her this first, I’ve given her my fb, email passwords so she doesn’t have to worry as much,(was drug addict) bought drug test snd gave her so whenever she wants she can test me,she believe i made a mistake but I need to get her trust back , I know I sound like someone this shouldn’t be in relationships but I’ve gotten over my mental health issues and i want to show her and make her feel as special as I feel, she still loves me and wants to be with me but does trust me.