At the latest Comic Con, Billie was at she was asked about Rose’s life in Pete’s World, to which she replied she would lock Tentoo in a closet and leave him there while Rose went out and found her way back to her one true love. The next day when asked a similar question she replied, that Rose would spend her time mapping out and plotting out ways to get back to THE Doctor, after having to make breakfast for “the other one”. Then when somebody jumped in to Tentoo's defence, she responded 'Oh, you like him??'.
In conclusion Billie does not like Tentoo.
In conclusion this is why we have the headcanon.
In conclusion idk what to think about Tentoo anymore. :'(
I wanted to share this with you guys, to see your opnions. Comment your thoughts, please and thanks!