It was the "Meghan made Kate cry" version of events that was released in the press first. Meaning Kate and William's side deliberately made up a lie about Meghan to leak to the press.
But as someone else said, it is believed Kate did cry. They probably did have an argument.
The issue wasn’t what happened, it’s the fact that the press repeated the ‘official’ version of events over and over and over again for literally years to push the ‘saintly Kate, sinner Meghan’ narrative and KP did nothing to stop them.
The Royal system has always been ‘never explain, never complain’. Catherine was almost certainly just following protocol that private events are not discussed in public. There will be times when she has had untruths said about her and keeps quiet. M and H obviously didn’t like this system but not fair to blame it on Catherine. It’s speculation too that the Palace purposely leaked the story.
On a separate issue issue Meghan has form for lying. She said that she had nothing to do with the Finding Freedom book but then emails were found that she had written a biography outline for the authors to be given to them by a third party. She had to admit to the appeal court she had forgotten about writing it!
As someone else wrote above, Harry and William seemed close at one time and he described Catherine as like a sister he never had. Even if Harry found it difficult playing second fiddle as the second son in the Royal family - and it’s not an easy role - I can’t believe the closeness he seemed to have with W and C was all fake at the time. The sad thing about this all is the rupturing of a once close relationship of two brothers.
I don’t know whether this is true (speculation is all we have with this whole thing) but a ‘source’ said that after William and Catherine married, had children and became naturally more separated, Harry started to worry about his role in the royal family. His last two girlfriends reportedly ended the relationship as they were not keen on taking on a role as a member of the royal family and he feared becoming middle aged and less relevant. No longer one of two popular young brothers in the limelight. Could see this could be possible, but who knows.