What are the poet’s thoughts and feelings in the second and third stanzas?

    When I, all instinct,
stared at her, she, all instinct, inclined her head away
as if she’d divined the much married life in me,
or as if she might spot, up platform,
some unlikely familiar.

For my part, under the clock, I continued
my scrutiny with unmitigated pleasure.
And she knew it, she certainly knew it, and would not
glance at me in the silence of not Adlestrop.