Hi Ambiv. I strongly agree with the others, just a simple acknowledgement stating that you are sorry and you realize that it's his choice.
When H told me that he was done, he was certain this time and he was leaving, I simply said to him, "I'm sorry that you feel that way. I don't feel the same way, but I respect your decision." That was IT. Then he left. After that, I treated him as a business partner only. And tried to keep up my PMA best I could.
Best of luck. Thinking of you!
M: 8 yrs T:14 Twins:7 S:5 BD:'NLILWY': Feb/2013 Mar/Apr/May: MC June: "living in limbo" Sept 12: H moves out Oct 20: reconciling Jan-Feb 2014:MC Feb 2014: separating, and H moved out.