So? I cut my wife's cellphone off, and within 3 hours, she had her own. That's not the point. You do it to draw a line of personal integrity, and stand up for yourself and for your marriage.
You are ENABLING her adulterous behavior. Your self-esteem, over time, is going to erode further and further, and she's going to lose whatever remaining RESPECT she has for you. And since women tie their feelings of LOVE very closely with their feelings of RESPECT . . . .
