AK unimproved, whats your play?

[SlamminP]

Villain is 26/3.6/0.86 after 80 hands

I felt villain had overcards and was trying to push me off my overcards. I stuck to this read throughout the hand and didn't consider any other options. In hindsight, If I had glanced at his aggression factor I probably would have folded. What's your play in this situation?

Party Poker 2/4 Hold'em (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Preflop: Hero is MP2 with A, K. MP3 posts a blind of $2.
2 folds</font>, MP1 calls, Hero raises</font>, 4 folds</font>, BB calls, MP1 calls.

Flop: (7.50 SB) 5, 5, 6 (3 players)</font>
BB checks, MP1 checks, Hero bets</font>, BB folds, MP1 raises</font>, Hero calls.

Turn: (5.75 BB) 8 (2 players)</font>
MP1 bets</font>, Hero calls.

River: (7.75 BB) T (2 players)</font>
MP1 bets</font>, Hero calls.

Final Pot: 9.75 BB