<human>: My ex broke up with me a few months back due to my drug use. I tried really hard to get clean but have had a few slip ups recently. Anyways, i was doing better and my ex and i were talking regularly and she had agreed that if i was sober until September we could try again. Yesterday i fucked up again and she knows and i have completely ruined her trust in me. How can i ever earn it back? I know I want to spend the rest of my life with her but I'm afraid i have ruined my last chance. Any advice?

Summarize the given text in a few sentences.
<bot>: I have broken the trust of my SO several times and am now seriously committed to getting clean and changing my life. How do I show this to her and earn back her trust?