When you are wanting to save your marriage, there are positives and negatives to living together but separated.

I got my W to move out by being firm about my boundaries (no dating). This was done before I filed for a D. I did not intend to file, but after she moved out, she made a very poor judgment by exposing the kids as part of her affair. Had I filed first, I may very well have been in the predicament that FIB is in.