I'm going to be honest with you in that I think you are in a crucial point in your sitch where mistakes can cost you dearly. She is trying to manipulate you!!!!!! She's having an affair and she doesn't like your attitude wtf???? She's trying to control you with sex so do not give into your boundary.
She's trying so hard to end the affair. The poor baby. How about trying hard to save her marriage and making up for the damage and hurt she has done????
Your next moves better be from strength or you better fasten your seatbelt because you will be on a long painful ride like you have never felt before.