I think that this sentence is really showing the narrator and the reader the personality of someone struggling, showing perhaps a potential insight into how Sonny may have acted or looked before his death. I also thought that this line was heartbreaking for the reader because you can infer that this person has an extremely low view of themselves, perhaps contributing to how they live.

I thought that this line was specifically heart wrenching within the story because I think that it displays the sad reality of loving someone with an addiction and not being able to ever fully understand, because there is no logic or sense to it. I thought that it was enforcing the idea that an outsider looking in will never be able to understand someone's own personal struggle.