Why is my boyfriend so obsessed with his cat?

this cat is pure evil. I found the cat in a tree, abandoned by its mother. I bottle fed this kitten and the other kittens to health. We found homes for the other kittens and decided to keep this one. yes, at the time i fell in love with this kitten. what kitten isn't sweet? as soon as the cat go teeth, she started biting really hard. we tried everything. i think this damned thing is ferel. there is no taming it. this cat has attacked my face repeatedly. after the last attack, i realized it was not safe for me to be in the same room. this damn cat was not abused, just hand raised. i have never seen a cat act this way and begged my guy to get rid of it or find a new home for it. he refused and said he would leave me before he got rid of the cat. for the last year, in our small one bedroom apartment we co exist. i care for him so i put up with this. i sleep in the living room. he has to put it in the room because i don't feel safe. the cat has attacked him pretty bad, he still wont get rid of it. we have been together for five years. the last year has been bad because of this cat. as soon as the cat starts meowing he literally runs into the other room to her aid. we can;t get through making love or watching a movie because the cat will start meowing. he sleeps in the room with the cat because he feels sorry for her. he spends half his paycheck on things for the cat. we can't go anywhere for more than an hour because he has to check on the cat and feed her three times a day. when we are out to dinner we have to get our food to go because he starts worrying about the cat. he has threatened to break up with me because i cannot bond with the cat. there is not a day that he doesn't do on and on about how sorry he feels for the cat. this cat is only put in the room when i come home from work. this cat is the reason for all of our arguement. his phone has only pictures of the cat. his family and friends are concerned with his unhealthy relationship with his cat. even the vet told him it is not healthy to keep this cat because it is wild. so he is willing to lose me and push everyone else away for his precious cat? i don't get it. i hate this cat, but I would tolerate it if it didn't try to scratch my eyes out. why is he like this?