I asked him how it ended and he said, "The same way all relationships end, one person likes the other person more throughout the relationship and then randomly the roles switch and the relationship can't survive the role-reversal so it ends."
I had never heard someone describe a breakup in such a detached yet analytical way.
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British journalist and author, Dolly Alderton, calls this exact breakup phenomenon 'the flip' in her latest novel Good Material. The male protagonist talks about how his relationship ended because one person was more keen than the other.
What this does is make the person who's less keen act as the "manager" of the relationship. They're the person who sets the pace of the relationship. When to move in together, when to go on couples trips and when to get married, for example. The "keen bean" is just happy to be there.