Mattius is right; the Ents retreated because of the settlement of Men in Isengard and their need for industry. Also, they felt they were able to because the threat of Saruman and his orcs was gone for good, and they didn't need to watch out for the huorns anymore because they knew Men would not harm them (which they don't, really). So there's your explanation! And because they went so far north, they don't know about anything that's happening in Isengard.
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That best portion of a good man's life,
His little, nameless, unremembered acts of kindness and of love.
.................William Wordsworth
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