having an icky day... fighting the useless thoughts
I think its normal (and healthy!) that this happens from time to time. No need to jump head first into wallowing or 'what if's', but to reflect and remember is good. Its hard for me to think back to that time (when xH cheated, etc) because the hurt was almost unbearable, but from time to time I can reflect for a bit.
Then we need to let it go.
You can do it.
Your icky day will pass, and the icky feelings will come and go faster every day.
