Is it the person who breaks up with you who's the cheater?

If someone breaks up with you which one was the loyal one the one who stays single after you break up or the one you find someone after you break up?
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I ment who "was" the loyal one when we were in a relationship. say Someone broke up and then got with someone right away after. dose that make them the one that cheated
Is it the person who breaks up with you who's the cheater?
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