I hate how a lot of people refer to Snape’s unconditional love for Lily unhealthy orcreepy obsession. Never did Snape obsess with Lily. You talk as if he stalked Lily. No. Please. Stop. Did he write Lily’s name in his books? Did he lay at night thinking about his and Lily’s romantic future? He was more obsessed with Dark Magic and his jealousy with everything James Potter had. Lily was his ONE and ONLY TRUE FRIEND. And that is why he was loyal to her and loved her unendingly.