My wife will not sleep with me at times if we have had an argument for several weeks. How much of a sin is masturbation in such circumstance. JazakAllah.
Wa Alaykum Salam,
Masturbation is not an option at all. By such behavior your wife is risking to cause a great deal of Allah’s anger and dissatisfaction with her. You are to warn her by explaining that such behavior is completely unacceptable from the Islamic point of view.