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What reasoning leads Juliet to entertain the possibility that the Friar might be betraying her?
In order to marry them, the Friar had to betray the families; so why not her and Romeo?
The Friar might try to avoid having to perform the ceremony by poisoning her.
Perhaps he thought by killing her, the feud could end, and peace could come at last.
Maybe he wants to keep Romeo from coming to Mantua and being caught.
The potion does not actually work, and he didn't want her to kill herself, so he gave her poison.