Pensa, "dark" is not the plan, kicking her to the curb and meaning it (not pretending) is the plan, this isn't a game of who can maintain no contact/going dark the longest, you have to mean it. She cheated on you, she f!@#$%*'d up, now she lost you, game over, case closed. As far as you're concerned, it's over for real and she has to deal with the consequences of that.