The assassin's dagger definitely is not cursed, and makes one of the greatest second weapons in the game. Unfortunately it's also the quest item to become an assassin (walk into the rogue's guild with the character carrying it), and he'll take it from you then, unless you don't have the patch and are prepared to exploit a bug.
Ignore his sending you to the boogre caves, and keep talking; he should give you the dagger.
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