According to Lady Bracknell (Aunt Augusta), what is the relationship between behaving well and feeling well? And how would you explain this?

Lady bracknell notes "they rarely go together"

Explanation:

From the movie, the character lady bracknell notes behaving well and feeling well rarely go together and such do are very different with minimal relationship

From this, one can deduce that behaving well could mean adapting and conducting properly to expected norms and popular guidelines. Feeling well on the other hand would mean feeling good about one's self regardless of whether the person has behaved well or not.