She's scared. And Angel couldn't quite figure her out until he just gave up and thought of her as a vampire. She does want to be held onto, and no one in her life has ever done that. The only person Angel knows and trusts well enough to deal with Faith is Blair. So, Angel will be renting Blair a big, huge warehouse where Faith has room to train and just be Faith, and Blair will get to babysit/provide therapy. It's good to know a Fatum demon with a minor in psychology.