I really couldn't see Billie being any other way haha. Just like I figure that Alex wouldn't be able to be funny and sarcastic with his sister missing. Don't worry Alex, Jo will understand, even if you are a dick not saying that he will be. Logan will be worried as fuck about Billie, and a little pissed at her when she comes back.
Haha she will find it funny as hell, though she will be blushing a lot about him saying he was being pretty for her.