Guy liked to call pretty loose throughout the game, though I don't remember him missing a single cbet so far.

I haven't 3bet for value against this guy yet so I didn't see a reason to get out of line with a more marginal hand here that is already going to play decently in position. Maybe 3bet is better, calling can't be bad.

Now here is where it gets weird. I think he cbets just about his entire range here, I don't think this guy is considering balance at all. IF he is not considering balance then I think it's safe to say that his flop checking range is very close to 100% big hands. 55, 99, J9, AA, KK, QQ, JJ, AJ and maybe T8 or QT as well. I also think it's pretty ridiculous to only give him massive hands because of one check, I just feel like he bets so much in this spot. What else checks here when someone plays their betting leads aggressively? But I'm not in the mood to bet/fold TPTK.

Now in the very reasonable chance that I am wrong here, let's give him a standard checking range. OOP he could be checking here with 22-TT minus 55 and 99, AK, AQ, QT, KQ, K9, Q9, 54, 65. Please correct me if that seems wrong.

The pot sized bet here I thought was weird again. He's been a very 1/2 pot kind of player so far so I'm thinking either a) I was wrong about what his check meant on flop or b) He's trying to pick up missed value from me checking back.

Either way I think that I have a hand that at least calls one street. If I was right then he's blasting off with boats/quads, or thinks my check back means showdown value and is getting money in with QQ-AA. Both I think are reasonable. If I was wrong then he's pulled ahead with a big chunk of his range. Looking at his range like this, I don't like my call but do I really just fold AJ here to one bet? I mean I can easily have a 9 too, do I raise/fold? I'm for sure raising all my 9x here with the amount this guy likes to call.

And I hate this river. Straight made it, turn bluffs hit, turn value hands improved. The only thing I beat now is a stone bluff and I don't see one.