A particularly cruel way to end a relationship with someone you no longer like would be to spend a whole day, maybe a week, worshipping your partner, boosting their confidence, embracing intimacy and celebrating their body, making plans for the future - that type of thing.

And then finally when you're in bed together, after some intimacy, listening to your partner open up about their love and appreciation for you, how much fun they've had being with you, you get out of bed and tell them it was all a lie. Laugh in their perplexed face and tell them they're worthless, insult their nude body right there on the bed. Then calmly leave, emphasising the point that you really don't care about them.

Haha, don't get any ideas! I'm hoping this is just out of curiosity