Here we have an obvious typo in the 1841 British edition, the replacement of the pronoun he with we. This visual misreading was corrected in the following LDS edition (1849). Although we is theoretically possible, Jacob does not use the personal pronoun we in any of the discussion contained in chapters 2–3 (the original single chapter II), which deals with the moral transgressions of the Nephites. Nor does Jacob ever use the royal we in speaking to his people.
Summary: In accord with the earliest textual sources, continue with the pronoun he in Jacob 3:1.