My ex acted the SAME WAY as yours are now. Said she wanted a "trial separation". She was cold and un-approachable and the "wall" was up. In reality, her and her boyfriend were plotting a new life together and how to gouge me for every penny to help them fund it. And I fell for this baloney for 6 months till I realized I was being taken for a ride. If I were able to have a do-over, I'd never have married that woman. My advice? Hire a P.I. Then you'll KNOW for sure if she's being honest. Many gals leave their husbands and that security, for security with someone else. Not all, but many. Guys are the same as well.