My boyfriend and I recently moved in together. I have a cat and he has a cat. Great. Not really. My cat is very calm and chill, his cat is younger and hyper. I have kept them separated for about a week so far. They have seen each other, and my cat is no longer hissing. My question is how do I stop my boyfriends cat from constantly chasing my cat who is stressed by all the changes? They are both males, my boyfriends cat is not nuetered. I adopted my cat from a person who could no longer have him and he was nuetered when I got him. Any advice would be great.