BF allergic to cat :/

Hello all I was just looking for some advice. My BF and I have been together for 2 years. We are now talking about moving in with one another. However, My BF is highly allergic to my cat. Due to this we spend most nights at his place. His symptoms are sometimes very bad and others he has been okay at my place when he takes an allergy pill and there is no contact. He said I can move in but he doesn’t want her. Due to his allergy. I knew this was bound to happen but I don’t want to give her away :/