A piece of advice I received that helped me detach and shift focus was posting about what are you doing, what can you do for you instead of what she is doing and how it makes you feel. I have not done this myself lately, but it is time I did again.
What are your GAL activities? Can you do things with your son/s?
I imagine in 19 yrs there were good periods. Who were you then? How did you behave? What did she perceive as attractive about you then? Now is not the time to be showing her these. Now is the time to be these again.
BITS Me 55, ACK, when did that happen? Doesn't feel like 55 D 30 S 27
You create your own universe as you go along - Winston Churchill