Oh, it was a HUGE deal when my H announced he wanted out and then left. I was a wreck for months. I wanted to work on our M, he did not. He left in June and that's when I did start to detach, let go, date someone, etc. Finding out he was seeing someone is what set me back--it was totally unexpected and just felt like a kick in the stomach. I guess it was also definitive proof that our M was really truly over.
But, yes, I know that if I were currently in a happy new R myself, I wouldn't care as much.
Me/X-H: 47/48 T 19 yrs M 16 years D14 D10 ILYBINILWY: 10/07 H moved out 6/08