Why Did Gregory Kill Cassie in FNAF: Security Breach — Ruin?

In one of the endings for 'FNAF: Security Breach — Ruin,' players watch as Gregory betrays and supposedly kills Cassie during her escape. But why did he do it?

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Y'all I think Gregory's gonna be the Elizabeth Afton of this new

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Security Breach Ruin Dlc Cassie and Gregory by Abel186 on DeviantArt

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