I've read a lot of very good fics where jack has come back from the Year-That-Never-Was to find that Ianto had either moved on or was so angry that he made Jack really work to regain his trust
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I would really love a heavy angst fic where Ianto breaks it off with Jack after the Tosh tells him about the Real Jack Harkness, and realising what he has lost, Jack has to work hard to get him back.