Loki sat where he was. He was in solitary, and he was told by his adoptive father, King Odin, to think about what he did. When he thought about what he did, he thought he would do the same things again.
If his father knew he was thinking these thoughts, Odin would probably never let him out of solitary. Loki didn't know if that was Odin's intention or not, but he certainly hope it wasn't his intention.
Loki was beginning to find being in solitary very tedious. He knew this was supposed to be a punishment, and in some ways, it was. He didn't mind being by himself. It seemed like he was always by himself.
Thor or Odin or anyone else never understood Loki feelings. How could they? He never felt apart of them. Even when they were with Sif and the Warriors Three: Fandral, Hogun, and Volstagg, they never understood him either. He even tried a few times to say something, but he couldn't ever do it.
Perhaps that is why he acted out. He knew that this is who he is, and will always be. He knew that's why he would be sitting here because he would do the same things again.