“My new boss loved me at first and now can't stand me”

What could be going on

Idealises, then devalues: Fits exactly; check whether others have gone through the same cycle with them.

Idealise-devalue-discard cycle: Fits if it moves from praise to contempt to pushing you out.

Splitting: Fits if you went from all good to all bad with no middle.

Halo effect: Fits if early praise was based on one impression that faded.

Narcissistic injury: Fits if the turn followed you disagreeing with or outshining them.

Role conflict and ambiguity: Check whether expectations shifted without being told to you.

Also said as

• I went from favourite to target
• my manager used to praise me and now she criticises everything
• he put me on a pedestal and then dropped me
• why did my boss turn on me
• my boss used to like me and now hates me
• my manager went from praising me to criticising me