This manga is great so far. I don't get why the MC doesn't just explain they used to go to the same school if he wants to clear up the misunderstanding though.
Honestly, pretty fitting development/reaction for them. And it's much better than her passing out drunk and not remembering the next day, him saying "just kidding" or whatever other excuse authors use to avoid confessions all together.
Something definitely happened between Shinshi and his wife, right? Hence the pages focused on showing how much he loves her. It'd sort of work as mirror-situation to what's happening with the MCs right now too.
I'm pretty sure he's crying because he saw her (since he was already thinking if going to see her would be a good idea or not) and it won't be some sort of miscommunication.
@saber05 I think that's why Yukiko exists, to led him in the 'correct path'.
I forget what chapter it was, but there's a memory of Ai's birthday; in World A the MC regrets not giving her the gift but in World B Yukiko makes things go smoothly iirc.
Edit: I didn't remember her full name was...