I know that everyone is assuming that Hurley's flashforward occurred before Jacks at the end of season 3, but we don't actually know this for a fact.
It is possible that Jack had his mini breakdown soon after getting off the island, and then by the time he goes to visit Hurley he is feeling a little better and has got over his obsession for getting back to the island.
His comment about growing a beard could just be Jack being ironic because he has recently shaved his off.
In a program like lost I think it is wrong to assume that we know what is going on.
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