I fold the nuts preflop

[FionnMac]

Go on, tell me this is horribly weak..

UTG is a pretty tough aggro 2p2'er (24/19/3).
CO is more TAG, 18/14/2.
CO and myself have no history at all, but UTG and I have been 3-betting each other fairly light, though nothing crazy, and i have shown down a couple of bluffs recently vs him.

I decided to mix it up and flat call here, standard would be to 3-bet. In hindsight, that was a pretty big mistake cos UTG must have been getting tired of my 3-betting and ready to play back. If it was me who had 3-bet here, it would be a no brainer push, but i was a little worried about the CO so decided to fold. Thoughts?

Party $2/$4 6-max.
Cut-off ( $ 572.30 USD )
UTG ( $ 415.90 USD )
Hero ( $ 520 USD )

Dealt to Hero: Ac-Kc
UTG raises to $14
Hero calls
CO raises to $60
3 folds
mlpzaq raises to $144
Hero folds