My boyfriend wants a cat, but I don't because I'm allergic. Am I being selfish?

Talk to your doctor. My brother is deathly allergic to bees, but he chose to get needles to help prevent getting a reaction to them so that he could join the army. Maybe you can see if there is something like that for cats? Another thought I just had, are the non-allergenic cats? I know that my cousin is really allergic to dogs, but she got a hypo-allergenic dog and she has no problem with it around the house. If you really can't get a cat because the two suggestions above do not work, then you are not being selfish. Getting a cat could put your health at risk. He needs to understand that for your health, the two of you cannot get a cat.