Jason had issues. Not only did he have anger issues, PTSD, his family was basically waiting for him to snap (minus his twin, of course), and a long list of others, but he also had seperation anxiety with his twin sibling. The two were practically inseparable ever since birth, only seperated when one of them sleeps with a lover or if one of them is in the bathroom.

When Jason died, his twin was there, and they died together. When they got revived, they were revived together. When they were out on patrol, they did it together. They did literally everything together, even trained alongside each other in the League of Assassins.

In fact, the school that they were in back when they were younger (and have not died yet because of that stupid clown, Joker) had to keep them in the same class and beside each other at all times or they'd both get panic attacks. They were also both Robin at the same time. Confusing, I know, but the two looked almost exactly alike, so it looked like Jason or his twin had a doppleganger just following each other around.

When Bruce Wayne (Batman) had adopted them, he didn't know better when he gave them seperate rooms. Jason's twin had found a way to sneak past Alfred in order to sleep in Jason's bedroom, and when Bruce found out, he gave them a singular bedroom.

Now, in the present, Jason and his twin were just chilling on the couch, watching a movie on the TV. They were roommates, as always.