A person that's truly moved on is completely indifferent.
When you're indifferent about someone, you don't think about them, post about them, need to vent about them, let alone analyze the look on their face and plan what to say to them the next time.
They become nothing but a long lost memory, like the color of the sweater you wore in second grade.
In fact, you're venting because you're continually thinking of her, which creates the feelings that need to be vented. Cut off the supply.
Get to that place by NOT thinking about her anymore. Think on other things, like your clothes shopping, force yourself to stop thinking of her when she pops into mind and think of something else.
"You can't stop a bird from landing on your head, but you can stop them from building a nest".
As long as you dwell on her, she dwells in you.