..
She didn't try to make her seatmates fall in love with her in ch1 and earlier, so his suspicion was slightly off the mark.
(Her aim was to avoid becoming disliked by her seatmate.)
In ch2 it's clearly stated she did change her goal to what he practically accused her of, so yes she's indeed trying to make him fall for her now.
(She took it as him challenging her, kind of.)
To him it just looks like he was right all along. (So ofcourse he'll be on guard and fairly indifferent to her manipulative attempts.)