So, she went too far: fine. All she cares about is how she can make him own his share of the blame. Confront him with her grievances? No, that’d look petulant and reactive. Could she respond with a simple “lol”? Being glib would give him an excuse to sever their friendship with equally low effort, and he’d probably feel more relief than guilt. Ignore him? Wounded, weak, mind-gamey, plus, her absence would be punitive only if he cared about her. Retaliation is impossible when he’s doing so well. All she can do is scrabble around in ineffectual rage like a cat chasing a laser.