There must be a reason about this. Yuri herself knew the feeling of being bullied. She wouldn't change so much from those years she was gone that even her personality flips from being bullied to being a bully, would she?
Now that became unrealistic when he still seem to care for that girl. Most of us would just assume we've been tricked since the start if we it's us in his situation and all of what she said were lies she made up as bait.