Aggressive Cat I Don’t Know what to Do

My cat (3M, tuxedo) recently moved into an apartment with two roommates and another cat. Everything was okay for the first few weeks, but then he started getting really aggressive. He seriously bites someone at least once a week and it’s only my roommates. I took him to a vet and his blood and urine work came back perfect. I got him off Craigslist in 2020– i was told he was 9 weeks old (and a girl) but when I took him to the vet, they told me he was in fact a 5 week old boy. He grew up in college with me so he is used to being around people— in fact, he loves being around people and will yell when he’s left alone. He seemingly attacks out of nowhere. One minute he is calm and cute and the next he just violently attacks. It has become a very serious issue and it’s getting to the point where I feel like the only solution is to put him up for adoption. He has bit one roommate so bad sepsis started to set it, and he keeps seriously biting my other roommate. The only person he doesn’t bite is me. We’ve tried Feliway, keeping him separated from the other cat (he like to yowl outside her door, which is causing her to urinate all over the room). I really need advice. I love him to death but I really don’t think i’m equipped to deal with him. i can’t afford intensive behavioral therapy as i’m saving for law school. I’ve owned cats before and they’ve never had problems like this. i don’t want to give him up as i made a commitment when i adopted him, but that’s looking like my only option. any and all advice is greatly appreciated.

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