Sometimes that happens, but I'm happy for you too. I'm just sorry we got separated and this is the first time I've heard about it. I can't say I'm surprised. He was always strangely intuitive.
It's nothing you did, and truthfully it was only something I've noticed in hindsight.
Consider that another very British thing I'm victim to: Inviting yourself to a party or event is strictly frowned upon. I'm glad you didn't find it rude of me. I've never been to Japan, but I'm looking forward to the wedding more than the location.