My BF is allergic to my cat

Without knowing about my bfs (20m) allergies I (20f) got a little baby kitten (Wednesday). Rn she is 2-3 months old. My BF comes over once every week and it looks like his allergies are getting even worse. How can I help his allergies without getting rid of my kitten. We both love her and ik he doesn't want me to get rid of her, but ik it can be annoying to have allergies every time you're at your SOs house. My BF is stocked up on allergy medicine but what else can I do to help him. I would also like to add I live in an apartment like dorm with 3 roommates.