What is it called when you want something but cant have it but when you get it you don't want it?

Answer 1

This phenomenon is often referred to as "reactance" or "the forbidden fruit effect." It describes the psychological tendency where individuals desire something more when it is unattainable, but lose interest once it becomes available. This can also relate to concepts of fleeting desire and the idea that the thrill of pursuit can be more appealing than the actual possession of the object or goal.