Please link to that study, because everything I've ever read on this topic points to the exact opposite.
As couples say they decided to not marry someone after living with them for a period of time, they discovered faults and traits about their mate that would have resulted in a divorce. Such as infidelity, lying, hiding serious secrets or in many cases substance abuse habits and abusive traits.
Things one can only find out after living together or marriage.
If you need to live with your girlfriend/boyfriend to learn that they are abusive, I’m simply shocked.