As to motive/reason: as unfair as it would seem, Brian would likely come out far ahead of where he should in a divorce. Ana had all the assets (hundreds of thousands of dollars in equity across multiple owned properties) and a job paying likely well in excess of $200K. Even with a pre-nup in place to protect her, there would be some division of marital assets and ongoing child support from her. Thus financial motivation to end things on his part seems unlikely. It seems more likely that even with the possibility of "losing" in a divorce settlement, Ana chose to divorce for obvious reasons. Perhaps Brian flew into a rage over something that transpired over the holiday break, and maybe that something was Ana informing him that she was leaving. This is why women are often instructed to leave the home first and have an attorney inform the spouse. Clearly Ana did not realize what a monster Brian is.