Ch4 Shows how he trivializes the society of young women with their albums and social platitudes, but all he’s doing is drinking wine and growing a little bitter.
Ch5 (and a lot here) can be read parallel with War and Peace for a look at (high) society – so much is identical.
I love her nightmare and how it alludes to Onegin becoming cruel and dancing (all the stomping men’s boots) with her sister. A duel indeed