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The one constant throughout all five sets of dreams and the things that were always hardest to compartmentalize.
That is... yeah, I have nothing for you beyond it being messed up. As for dream!you seeming to forget all the horrible? I don't know. Wanting to believe the best in someone and since he decided to ~show you~ some different side of him you latched onto it because to think someone can be that horrible and cruel can be too much.
Or the whole teenager not thinking things through and just being all "Maybe I can be the one to change him" thing that is depressingly common?