Don't give her the ring, as choice who get you to ntr path choose don't get ready and cancel the date at the last moment, leave her at the club, go to the park afterward, don't agree to see her momhow to lower the liz Affection? i playing NTR route
And as a general tip always let her get fucked by Matt (that will lower the affection more in the future since she has no willpower left)