There have been lots of people who state MS is a "control" freak. This sure proves them right. In almost all cases of men who abused/killed their wives they had wanted to control every aspect of her life, even to demanding she account for every minute of her time when away from home and cutting her off from friends and family just to name a few. Being Catholic, divorce was probably a difficult decision for Terri to make. Also, it is common that violence is particularly harsh when the control freak thinks his wife may actually leave him.
In his sick mind, he probably does believe he loves her, but this is definitely ultimate control! MS sadly wins.