my boyfriend and i recently moved in together. we somehow forgot that we each had our own cats that they would be making the move too. they obviously met each other the wrong way (sink or swim, not the slow, sniff each other through the door way) and now his cat constantly chases my cat, . his cat is older (2yrs) mine is only 6months. my cat does not want to play with his, we've been living together for 3 months and this hasnt gotten any better. i dont know what to do, i've told his cat no, i put them in a seperate rooms when they fight, and right after i feel they've had enough alone time and let them out , she goes right after my cat again. my cat now sits on the kitchen counter all day because she's scared of getting chased. i am at my wits end with his cat. and recently i've noticed she's(his cat) been vomitting. is she stressed? what can i do to make her stop chasing my cat? i talked to our vet and she said that some cats will just never get along. i cant spend the length of my cats live being stressed because his cat is stressing out my cat. please help.