The LW also never actually said that they had apologized or anything. Like, maybe they did and just didn't mention it, but it might also be a case of them thinking that their changed behavior is all the apology they need, and the uncle doesn't see it that way.

(Not sure where people are getting that the uncle preferred the LW as an addict, since the LW clearly says that their uncle bailed as soon as it became obvious they had a problem.)