This is really beautifully put, Liz. Here - have a rainbow
Hey, just because I don't want him visiting my cloud 9 doesn't mean he shouldn't take the rainbow road down some one's tunnel of love.
Why not Wisdom? She is his antithesis, his mirror, the thing he wishes he were. Her being twisted into a pride demon angers and terrifies him because if she can't be pure, if she can't be free of the faults that consume him.. What hope does the world have? Without her, without Wisdom, he must find a way through the future alone. And so he tells Lavellan, then, he hasn't forgotten Lavellan's kiss. That he loves her. For her wisdom. A wisdom he's been searching for since he lost it in the Exalted Plains that day. He realizes, in the fire swamp, that while wise, Lavellan isn't Wisdom. Can never be Wisdom. And so he leaves.
It will take thousands of years for Wisdom to reform. She'll be different. She won't remember him. But her essence will seek him out and remember what it was to have his fingers entwined in her's. Never moments, never flashes of the past, but always emotions she can't pinpoint bubbling to the surface when they're in each other's presence.