I don't think it's so much her not thinking he can handle it as it is her thinking that he won't want to handle it. She figures that his life is so stressful already that she doesn't want to add onto it and make herself a burden. Thanks so much for your comment!
Thanks for your comment on Lighthouse! I'm glad you like it! I'm glad the differences between Sid and Lee come across like they do; that's exactly what I was hoping for :)