This is my first time on any kind of message board, and I need help. My 5 year old cat has become very mean and aggressive towards my live in boyfriend. We've been living together for a year now, and it hasn't stopped. Lewie, (my cat) has always been very sweet and loving towards me and my friends. After I'd been dating my boyfriend for about 3 months, Lewie, became very mean. At first, it was mostly just hissing, and growling. Now it is more aggressive, he attacks. He is even mean to me when my boyfriend is around. When he isn't he reverts back to himself. When my boyfriend and I are spending time together at home, say talking, Lewie will meow, very loud, and growlish like, whenever my boyfriend talks. It's almost funny because it gives you the impression he is jealous. I have been very careful to not change my behavior towards Lewie, but it's getting very hard on all 3 of us. My vet has had a couple of suggestions like having my boyfriend feed him, etc. nothing has helped. He says he's never seen this before. Not to this extent anyway, it's been a year. Any help would be very much appreciated.