Ok so I have a female cat about 3 named Nirvana and I had to bring her to my boyfriend's house for issues at my home. He has an older male cat named Damien who is older about 6 or 8. Now, both cats are really sweet, but the moment I brought her over she hisses at Damien. All he wants is a friend, he follows her around when she's out of the bedroom, but she hisses and paws at him claws out. It's been 2 weeks and she mostly stays in the bedroom with us. I don't understand why they don't get along, she came from a previous owner who had a way older male cat (about 10). Both are spayed and neutered. Does anyone have any ideas or comments on how I can get these two to get along or something I could try? Thanks