Sid was truly a good person the parasites in him just had too much control I feel he truly just wanted to be loved and needed like how the dirty blonde/brown hair dude said just not how he said it sid struggled to understand the true meaning of love and it made him who he is I feel that the little love that Metatron gave him truly changed a lot inside him causing him to change this much and sacrifice his life for Cain and help the human in the chapter he was gonna be k!lled I think that's. Sid truly is a misunderstood character who struggles to understand his own emotion (I'm sry for making this paragraph)
I'm BBN rn (meow)