I'm with so many of the girls here. I understand that cultural differences may make it difficult for him to appreciate your kitty. However, I find it very disconcerting that he doesn't appreciate that you are attached to Kitty and that you don't want to get rid of her.
To me that's absurd. It's not like you yell at his best friend whenever he comes over because you don't like the friend. There is no difference here.
Maybe you need to sit him down and explain how important Kitty is to you. Maybe he just doesn't understand that point. But if he does and just doesn't care, I'd start standing up for Kitty and for yourself.
I'm also concerned that there is something more fundamental at hand. Like FI can't tolerate sharing your love and affection. If that's the case Kitty is just the object du jour, and if she goes, it's going to be something else that you love and care about... and then something else... and something else until the only thing of any meaning in your life is FI, because he's forced you to abandon friends and family to prove to him that you love him. And that's wrong on EVERY level.
Start by talking with him. If he doesn't understand, then I'd really slow down and give this some thought.
Good luck!!! I'm pulling for you - let us know how it goes!