Oh no, no it's fine don't apologize. You didn't do anything wrong.

[ She knows that this will be wasted effort since he's still addressing her formally. ]

That's really nice of you. Thanks. I'll definitely be prepared then.

[ He sounds a lot more sincere than a certain person but that's fine with her. People were different after all. ]

I'm not so sure of that and I don't really want you to take the risk. I'd feel bad if you really went down or got sick.