Cho Chang

Obviously, she is feeling very sad, because of Cedric
dying. Then I expect she's feeling confused because
she liked Cedric and now she likes Harry, and she
can't work out who she likes best. Then she'll be feeling
guilty, thinking it's an insult to Cedric's memory to be kissing Harry at all... And she probably can't
work out what her feelings are towards Harry anyway, because he was the one who was with Cedric when
Cedric died, so that's all very mixed up and painful.