Awesome
Exactly like what I think, thank you very much.
Oh, and sorry for the unclear explanation of the deduction (I did that sometimes) but it's quite logical if explained like
Ichika spouting personal information ->
Chifuyu asked how the hell he knew, implying that he's a stalker or a spy ->
He can't prove that it's a firsthand information that he experience himself, not something he gained by stalking ->
FemIchika think he can't prove himself as innocent and he worried being accused as stalker or something, not because FemIchika think he IS a stalker _>
Chifuyu acknowledge him as unable to prove that he's Ichika with only such information at hand ->
He gave up and basically "Screw this, I don't care anymore"
But without explanation, yeah, troll logic