FY, this change in feelings is very familiar to me. I had no idea that in your situation (when your W lives in the house and you talk) you also get these feelings of being done. In my sitch (when almost nothing is going on) I do get some glimpses of hope sometimes, then it changes to the feelings of no hope and desire to be done. This is indeed a brutal rollercoaster.
Keep thinking the positive thoughts.
M:50 H:52 S28 (my S from previous marriage) M:17 + 3 BD: 06/12 S: 06/12 - H works in another state