Consider me lost in space....

[CrazyPsycho]

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Party Poker No-Limit Hold'em, $ Hero (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($39.30)
Hero ($52.75)
UTG ($91.30)
UTG+1 ($45.95)
MP1 ($34.30)
MP2 ($25.65)
MP3 ($28.75)
CO ($54.70)
Button ($42.15)

Preflop: Hero is BB with K, Q. SB posts a blind of $0.25.
5 folds</font>, CO raises to $1.5</font>, Button calls $1.50,1 fold</font>, Hero calls $1.

Flop: ($4.75) 5, 7, 3 (3 players)</font>
Hero bets $2.5</font>, CO calls $2.50, Button calls $2.50.

Turn: ($12.25) K (3 players)</font>
Hero bets $7</font>, CO raises to $20</font>, Button folds, Hero calls $13.

I'm totally lost as to what this raise is....I would expect an overpair to raise that flop? My inital thought was possibly AK, but I'm clueless so I just called. I think pushing would be really bad here, he seems real confident about his hand for whatever reason.

River: ($52.25) K (2 players)</font>
Hero??????

Now what?? I definitely rule out AK now. I have a very, very hard time putting him on a set as well the way he played it. Aces? Confusing. Push? Kill myself?