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Reign Sneak Peek: Mary Finally Loses It, Lashes Out at Lola Over Francis

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I guess the old saying still rings true: You can only spend so much time in the same castle as the woman who mothered your husband’s child before something has to give.

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OK, that might not be a time-honored pearl of wisdom — yet — but it certainly applies to this exclusive clip from Thursday’s Reign (The CW, 9/8c) in which Mary and Lola finally address the baby elephant in the room.

“Has it ever occurred to you that your cage is of your own making?” Mary snaps. “That the bars formed the minute you decided to sleep with the man that I love, knowing that I loved him still?”

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As you can imagine, Lola doesn’t appreciate being called a trollop — in so many words — and things get heated between the royal frenemies.

Hit PLAY on the video above, then drop a comment below: Do you agree with Mary, or is she totally mishandling the situation?