Ed pulled back when she uttered those words. She... what? He was actually more confused by the abruptness of it than what she actually said.
"Wh-what?" he asked, definitely looking more confused than upset. The words came out in a bit of a pant, too, as he tried to slow his breathing to normal and get his body under control.
His brain was really only starting to process the actual words at this point - his brain sstill confused as he tried to get his hormones under control.