I'm really happy for Michi, rather than celebrate her passing the test with everybody she decided to celebrate with herself which I think is really respectable.
Also, I really hope she finds out about him cheating on her because even though Michi emotional cheated (and in any other case I would be take the latter side rather than Michi's) on You she did it because she wasn't getting the love and attention from her spouse so she sought somewhere else. Which I still don't condone rather than cheating on him she should have clearly communicate to You what's was going on with her and why she feels this way and if he didn't want to understand or try to understand right then and there she should have left his ass and filed for a divorce.
But, this isn't about what I think it's about the characters and their lack of communication.
I really enjoy this manga and I can't wait what's going to happen next!