Breathtaking!

This is a very interesting idea that Snape survived and no one knew. His thought read really well and I feel like your reasoning really suits him. I think I would have liked more concrete details of where exactly he was though. I was a little confused by that. But that is a minor complaint. I think overall this is really beautifully done.

Too bad he thinks that this miserable life is all he deserves after all he's been through. But then, nobody has ever loved him; amazing that he didn't turn out to be a DE for real (and if he had, Voldemort would have won).

Fantastic idea and nicely realised. You seem to understand Snape's character and motives very well. I love the relaxed flow of your prose, though all the paragraphs here are very lengthy and some might benefit from being broken up. Thank you for writing xx

I'd rather see this as a prologue than a vignette complete in itself. Doesn't he ever get over that shallow pretty girl and make himself a *life*?

(And when you say no one notices or cares where he is, are you implying they didn't even bother fetching his body for burial? Because that's just rotten of them.)