I feel so bad for Severus he was not trusted and hated by everyone except Dumbledore he was made to kill him and that made it worse he pretended to be a death eater secretly helping the trio and got viciously attacked and died to a snake and only when he had lived his miserable life did people realise what he had done
Oh did I mention the Lilly potter the one he loved got married to his bullie James and then got murdered