Since Susan is with Ian at his cabin, she's the last to hear that Mike has woken up from his coma.
In the meantime, Edie has been badmouthing her to Mike, who has retrograde amnesia and can't remember the last two years, including his relationship with Susan. He's been told Susan came to see him often, but Edie paints her as a stalker and insists the two of them were never in love.
Susan tells Ian that the two of them "never should have happened," and rushes to see Mike. She is taken aback when he doesn't remember her, but even more so when he tells her not to bother coming back.