He had a fight with Cecil a few days ago. It was a serious fight about Rex's arrogance and aggression, so Rex didn't even want to look, let alone ask for help from Cecil.

Rex went on a mission, alone, he did win but he was injured. He came to your place because he didn't have where else to go. He looked like shit... He had a black eye, cuts and bruising all around his face and problem body and he could't stand on his right leg.