Let’s say there’s a new kid at school. He takes an interest in you, and every day at lunch he gives you a pudding. You think he’s cool and nice and one of your best friends after a week of this, so you invite him over to your house.
While he’s at your house, it’s like he’s a totally different person. He’s rude, selfish, and destructive, breaks your toys and gets you in trouble with your parents.
So you tell him to leave and that you aren’t friends anymore. But then on Monday, he shows up with TWO puddings and the new Transformer toy for you. So you think maybe the other day was a fluke, and you consider being his friend again.
It’s basically that but for relationships. Someone is incredibly loving, showering with gifts, etc at the start of a relationship so that it escalates more quickly and you develop feelings for them/trust them. Once they have your trust, they often drop the ruse and become abusive, take advantage, etc. When that reaches a breaking point they may revert to the earlier behavior in order to get you to let your guard down again.
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