What Is Ghoulish?

I was living with my girlfriend in another roommate for just under a year. When we broke up, she moved back home and my roommate and I moved into a new place together. The roommate is moving out and he is claiming ownership of some of the various items my ex left behind. He claims that since we were all roommates before her and I started dating, we should split the booty equally. Am I crazy or should my ex's stuff be mine now?"