Yikes-I need some assistance!

My wife and I have been married for ten years. She has always had an off and on eating disorder. She recently has become very irritable. Because I have become complacent in our marriage I realized that she has been eating nothing for breakfazt a power bar for lunch and salad for supper.......for six months. She is currently hypomanic. I realized(read the clues) that something weird was going on and she was texting this fellow on average of 40 times per day for two months! She said she was enjoying the attention. When I realized it wasnt an affair she sais she wants to call off our marriage! She is acting very strangely...help!!