Well that was part of his character and its development. If someone’s past included drugs, then it would be normal in some cases to want to discuss as part of the healing the process. His past is part of his character arc and that’s what makes his growth process beautiful. We get to witness his growth and that’s a great privilege as an audience.
He’s what writers call a dynamic character:
https://www.masterclass.com/articles/dynamic-characters-vs-static-characters
Definitely what I assumed as well. Nora Ephron wrote a wonderful book about getting older called I Feel Bad About My Neck: And Other Thoughts On Being A Woman.