So when did this "Hikari never blames me" occur? That's where "before" came from.
I think Hikari can both not blame her and be done w/ her? In that Hikari doesn't think Aya's done anything wrong by being with Yuu (or even kissing him) (ETA: or still being in love with him) and that's why Hikari doesn't hate Aya, but Aya's refusal to be honest with Hikari is what makes Hikari done w/ their friendship. ETA2: I think blame is being used here the same as how Haru uses it when she says no one's to blame.
Which I think it's the same beat w/ Yuu - consistently what Hikari is upset/spiraling about is the not knowing what's flying rather than the past relationship. That's why the path to reconciliation in 45 is Yuu being honest about what happened - if she was mad about the relationship itself, or actually hated either of them, then there's nothing Aya or Yuu could possibly do to make amends.
Then it wouldn't have "in my dreams or in reality"
Dunno about you but most of my stress dreams are about things that aren't true. ETA: or yes this is Aya's wishful thinking that Hikari will be ok w/ her relationship w/ Yuu once Aya figured out the triangle.