1- he did stated he won't let her go back to her world + lied in her face cuz he need her ! So yeah his an abductor who locked her natural right of freedom .
2-she saved him he saved her so it's 50/50 gratitude shit
3- true she realized he was good to her with ( food and shatter ) after meeting some assholes , but thinking "oh I should be grateful " even tho his intentions are not pure and mixed with direct benifts (which is saving his life guiding ) is just wrong
she knew he wouldn't let her go back to her world, that's why she's trying to find a replacement guide so she could go back. she saved him bc she doesn't want/like looking at people dying before her, idk what's so grateful about that. and yea when ur literally being sold as merchandise ur gonna look back fondly at when u were fed 3 meals a day and kept clean. i'm just saying she's still acting within reason and the story is still bearable to keep up with
Duke : I will do everything for her ( relax u know her for 2 days as ability user not as a person , I bet u don't know her last name)
FL: he was so kind to me ( cuz u saved his life !!!, bringing ppl to his food table is not his daily dose of charity ) +kindness is the norm we all deserve it and operating with each other u just came across up normel ppl with no morals .