Help ladies

Im very confused and loss for words 😞 we just got a cat that my son with autism doesn't like he is not just battling autism he has conduct disorder bipolar ADHD ... Anyways I have a dog and bird that I had for years and this cat is my boyfriend who I been with a year I asked him we need to get rid of the cat because it's effecting my son he doesn't like it and it scratches and doesn't get along with anyone and keeps us up all night trying to bite on wires and things and such ... Anyways it's triggering my sons behaviors and my boyfriends being petty saying he is going to move out because he is upset about this cat situation ... What do I do should I let him leave and that's that or what ?