This secret could have been written by me, I agree with you so much about him being a jealous asshole and creepy stalker, definitely. And James YES!, poor James Snape didn't give a shit about Harry or James dying as long as Lily was spared, he only turned around because of Lily. Had Lily survived I bet Snape wouldn't have lost a second mourning for James or Harry before going about slipping Lily a love potion.