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Two pair does beat one pair, and your final hand is K-8-8-3-3 (the best 5 cards), so you've got 2 pair, 8's and 3's. Your opponent's final hand is K-K-J-2-2, so he's ALSO got two pair, kings and 2's, and because one of his pairs (the 2 kings) is better than the best of your pairs (the 2 eights), he wins.
If there weren't a pair of 2's on the table, and let's say for the purpose of illustration that one of those 2's was a 5 instead, he'd have K-K-J-8-5, which is a single pair of kings, and you would have won.
You lost because the other player is either arab/ paskistani / turkish / asian these are the countries that zynga love to win,,,i lost 4 billion on AAAA with the new player level 3 with 400 billion and still he went in because he had 2 3 diamonds on the flop was 4 diamonds so he needed 56 diamonds to beat AAAA and of course what with zynga being he worst poker site around and rigged he duely got the cards required to beat AAAA....thats how this **** hole works...it loves the arabs and asians