Oh sir, she smiled, no doubt, Whene'er I passed her; but who passed without Much the same smile? This grew; I gave commands; Then all smiles stopped together. There she stands As if alive.
same smile? - sibilance, he is jealous and insecure that she was able to treat everyone equally and immediately/quickly greet them warmly.
i gave commands - curt clause
all smiles stopped - euphemism for her death, ambiguous and sinister phrases make the reader wonder if he has any responsibility over her death.
As if alive - a sinister tone, a dark simile, caesure that follows, shows separation and unemotive language as he moves on very quickly. there are some darker implications.
ambiguous speech - hiding critical information, details, especially of her death.