I've had the unfortunate luck of being friends with people who thought it would be okay to change their minds on how they feel about something after a few days.
I've literally been told shit like, "It took me a few days, but I decided that I am actually angry."
Then I get a barrage of angry bullshit.
The entire world would be at war today if people think it's okay to simply decide that they're unhappy or angry at any time and then proceed to take it out on others.
This is how you never learn to move on.
If you've friends like this, block them.
They're narcissitic people who need to sort their own shit out.