The "joke" is her being a controlling abusive person. https://twitter.com/redditships/status/1245766042934284289

"Pranks" are about social exclusion and inclusion. It identifies and preys on a person's weaknesses. By making her partner the target of the prank rather than a partner in pranks, this asshole constantly places him outside the bounds of her "team". https://www.nytimes.com/2008/04/01/health/01mind.html

She just keeps initiating him over and over again. The only point of that is to keep him destabilized. There are only a few reasons to do that and all of them are about control. She is horrible.

People who need you to be insecure so that they can love you are abusers. Never, ever forget that. Or be that - never be that.