With her, it's hard to determine what's serious and what's not. So I wouldn't blame him.
Using the fact that he did it to blackmail him into doing it again. That's some high-level manipulation.
On one hand, her performance does imply she could be a good teacher. But her real personality casts some serious shade on that.
Yeah, ice cream in a hot bath is kind of a recipe for failure.
The last bit isn't much different from the first bit. Sure, you can argue that underwear and swimwear are different, but in private and when asked to, that kind of removes that difference.