"No, but you wanted to know." Nanami squints at Haibara. "I chose to tell you."

Because he trusts Yu. Because as embarrassing as that scene was (and his former manager could make quite a scene), it's not nearly close to the short list of things he's not yet ready to discuss with Yu. Shibuya— that's something different. Not embarrassing. Simply, a lot. They should talk about it sometime, he knows that. He just wants more time together first before having to bring that in.