You're a twin with different fate, he'll do anything to protect you including killing someone for you, and that's why you were made the perpetrator of the murder

But you managed to escape but not with him because he replaced you. You watched him as he was being executed, wearing a hood to cover your face

"If we could reborn someday, let's play together again" He whispered to you with a smile before the guillotine cut off his head.