My ex (F26) broke up with me (m28) after a year together on and off. She broke things off every time and recently broke up and pleaded for me back 3 weeks ago. I agreed even though I knew I was setting myself up for failure. After things seemed ok for two weeks until she came over before work and broke things off. Things felt so rushed and sudden after just taking her back. We texted briefly until the next day.

Things ended on a decent note but a week later I still had so much to say. I wrote a letter that apologized for my faults in the relationship, why I felt so strongly about her and my frustrations that I hadn't been able to fix things and communicate. Specifically when we were together she had tried to emphasize that she would never be unfaithful, implied due to the fact that she had been hanging with a male friend a lot recently. I was not worried about that but I expressed that It hurt that others made her so happy when I no longer could. I left the note expressing my deep hurt about losing her but also wishing her well on her journey to happiness.

I dont regret what I wrote because I truly meant it but God I regret actually leaving the note on her porch. I know I should've burned it and moved on but I can't change it. I feel so guilty and all I want to do is text her and apologize for doing it and say that I'll leave her alone but thats even more intrusive than what I've already done. How can I move on and process this guilt without bothering her? How can I get past it?

TLDR: Recently going through a breakup and felt rushed during the process. A week later I still had so much to say and wrote what was a genuinely heartfelt apology & closure letter. However, I'm feeling a lot of guilt for dropping it off and struggling to accept that I did it, help?