Been a mn for awhile but name changed for this. My sister has been married for 12 years, has a couple of kids, bobs along as the majority of us do with the typical everyday stuff of life etc etc. Both work, neither go out very often. She infact doesn't really go out. He might go the the gym or out for a drink with mates but think easily less than once a month. Suddenly he's had a personality change. Wants to know what's she's doing all the time. Had cancelled his social media and thinks she should do the same. Moody at home with her and the children. Hyper critical of everything in home and with her. Whats happened ?