Tori Spelling and Dean McDermott are said to have decided on a trial separation after 16 years of marriage. The pair reportedly battled to keep their turbulent relationship on track for the sake of their five kids before splitting. A source told Us Weekly the last update friends of the pair had got were that they were “going through with a trial separation”. They also raised fears for Spelling, 49, as they say she is “missing in action”. An insider added: “She hasn’t been doing social things anymore. She seems to be isolating herself. “She’s been so MIA that they’re worried something’s going o…