6/12 88 in cutoff

[DiceyPlay]

Very loose game. Not much aggression, but there's some. When I first sat down at the table, my impression of UTG and BB was that they were solid. They were raising on the turn and they both ended up having reasonable holdings.

On this hand I have 88 in the CO. There's 5 limpers (including UTG) to me and I raise. Button folds and the SB re-raises. Everyone calls. 7 players to the flop with 21 small bets. Flop comes 568 rainbow. Small blind bets, UTG raises, there's a couple of callers to me and I 3-bet. SB folds, UTG now caps. UTG and I are head-up.

Turn is an offsuit K. He bets. I raise. He 3-bets. What should I do?

Results to follow.