Oh, I'm sorry, that sounds like an unexpected bug! Does it say that he isn't allowed to go to the forum (that's one of the bad endings) or does it redirect you to the main menu? If it's the second option, there's nothing I can do on my end; you should uninstall the game and install it again. You can play it again with the Skip option and do only the battles and choices.
If it was the first option (Aelius not allowed to go to the forum), then load a saved game and remember he's supposed to attend his training in the arena every day, or his master will get angry.