You gave Ti every chance, and he'll be going right to a new home where he'll hopefully fit in better and be a sweet happy boy. And Miley girl can start feeling safe again. It really does sound like the best solution, even though it's a hard decision to make. Miley getting bitten would have been the last straw for me, too.

And if the breeder does give you an Aby kitten, Juni would have a playmate.