People in Slytherin are paranoid. If they love something, they will love it for a lifetime, whether it is dark magic or someone.
He followed the promise of Slytherin: we come from the quagmire, we are hungry for power, we are full of ambition, we are strong and calm, we are elegant and self-possessed, we never regret, we are Slytherins.
He is the blackest Slytherin, not a savior, not a philanthropist, not a wise man, and not even a love saint.
Severus Snape doesn't need anyone to redeem him. Maybe we want him to be happy. In the fandom, without exception, we want to promise him a beautiful and bright future. But in fact, he cannot give up everything easily. Lily and black magic are all things he wants to protect. We can't let him change from the beginning just because of his bad ending.
Slytherin never regrets. He is focused, paranoid, stubborn, serious, tolerant, and consistent. He only belongs to Slytherin, coming from the mire, but still noble. What I love is just such a man.
Conception: