Want to reply because I am just at about the halfway point of my temporary separation. We called it an experiment, to see what changed, and I guess another way of putting it was a trial separation. I decided moving out completely was too much but leaving temporarily was important.
I will say that I am glad I did it because it meant something concrete changed as a result of the EA. Even though DDay was a year ago, because we were caregivers I felt too trapped to do much about it. It wasn't actually the affair that was the straw that broke the camel's back in terms of my deciding to leave (it was his anger) but I knew I wished I'd had the strength to make some kind of stand when I discovered the EA.
After about four days being on my own I desperately missed him, despite everything. I felt so alone in my temporary sublet, and called him. Since then, we are in touch every few days or less. We have talks about what is happening and what may happen in the future. I really and truly don't know what will happen. He knows that we are considering a more formal separation and even divorce, as well as the possibility of attempting to reconcile.
It was his remorse on DDay and beyond that kept me staying, plus his IC work. However there have been setbacks, and I feel ambivalence from him about the importance of the marriage. He has given his mother precedence over almost everything in the past four years, and I tried telling him that the marriage is in danger as well, and deserves some attention (his mother can well afford good quality care). However, he continues to choose her care as the utmost priority while our relationship remains in jeopardy. I did draw a line there, and haven't been in a caregiving position since the separation. If there is no marriage, then I have no motivation to provide care to his mother...But I digress...
He has asked for a week of no contact, because for him the contact we do have makes him feel as if not much has changed. His personality is such that he could always go longer without feeling the distance between us. So I am prepared to do that for both our sakes. I think if overwhelming responsibilities continue for one of the partners, then it is hard to comprehend what is happening as there is no time to think. For my part I have had lots of time to think, read and reflect.
My advice would be to make good use of the time if you do separate, and convey the seriousness of it. Otherwise the spouse might view you as simply "on vacation." I remember reading that if you take such a step and the partner continues to act poorly then you have your answer.
To my mind I thought there would be major gestures to ask me to come back, but I am getting mixed messages instead. I still have three weeks. This weekend his mother is going into care, so we'll see how that changes things. I am also preparing for the worst mentally, which has meant lots of sadness and grief. I just can't believe someone who loved me would allow things to get this far without stepping up to try to make things better. I guess what is meant to be will be. I feel with the trial separation I have done all I can to indicate the seriousness of what's happening, and take back some power in terms of my own boundaries.