PHOTOS: 19 On And Off Celebrity Couples

They say insanity can be categorized by doing the same thing over and over again but expecting different results. So it is that we are occasionally unable to let past relationships lay buried beneath the earth, usually where they belong — and celebrities are, apparently, no different. Scroll on to see which Hollywood couples have also suffered the on-again/off-again relationship curse that plagues so many of us.

John Mayer and Katy Perry: John and Katy were back-and-forth in their relationship for quite a while before ultimately calling it quits in 2015, before Katy started dating nude paddleboarder Orlando Bloom.

Photo: Getty Images