turn problem

[dkarmab]

Just asking for opinion. From my live game. Players I have never played with them before so not much information. But the image I gave should b a tight on . 4 hours and showdown at 100%. 9 players on table deep stack. Utg opens to 6 bb. I'm in cutoff position. Whole table calls. I call with 3d5d. Button, sb and bb calls. Flop comes 2d,4h, 8s Bb bets 55bb. Seat 7 call . I call. Everyone else fold . 3 way to the turn. Turn comes 9d. Bb bets 125bb. Seat 7 folds. At this point of tim . What could I have done? (I asked to check it down, he agreed. No deals so river came another diamond and he completes his Ace high flus . He shows Ad8s)