Why is it that the person who never wanted you, now wants you when you no longer want them?

I once took interest in a single woman who didn't want commitment, but then found out she slept with our boss for bragging rights with her girlfriends, and perks on the job. Now that she was exposed for it at work, and the boss was replaced, I'm no longer interested in her. She's now an emotional baby about it.

Why is it that the person who never wanted you, now wants you when you no longer want them?
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