She's not the only one. Yu couldn't even remember that name or making some kind of announcement and from what she was saying, it sounds important and something he would never forget.

"I don't know that name or anything else. The last time we saw each other was when I was leaving Inaba and that was four months ago."

...on second thought, screw not saying anything. She needs to know and he isn't willing to hide that from her. Yu knows better.