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The entire time. Kristen was disappointed to learn that Pete had been lying to her all along.
From the start, throughout, from end to end, as in I've known he was innocent all along. [c. 1600] Also see all along the line.
all alongall the time; from the beginning.
all aˈlongfrom the beginning: I’ve said all along that this would happen. ♢ He knew who they were all along but he pretended he didn’t.
From the beginning; throughout: saw through the disguise all along.