Eddie was in the middle of sitting back down when Cho made her pronouncement, and he missed his chair. Fortunately he managed to catch himself rather than landing in the floor on his arse.
"I beg your pardon?" he asked, blinking at her. "I mean, er, congratulations. Of course. You know I'm happy for you if you're happy." Though of course he would have preferred that she lead into it a bit. That would've been nice.