72o in 4-8 Kill

[Broon]

Full ring game 4-8 Kill game making this hand 8-16. Hero has won 2 previous hands with a large pair and a nut flush and an aggressive history. LP UTG calls, TP in SB calls, Hero checks 7s2h (3.5 SBs). Flop comes Qc7h4s. SB checks, UTG checks, Hero bets, SB calls, UTG calls. (6.5 SBs). Turn comes 2d. SB checks, UTG checks, Hero Bets, SB calls, UTG folds. (5.25 BBs). River comes 4d. BB checks, Hero bets (a mistake), SB raises. Hero folds. (8.25 BBs) Comments? Any chance this guy was bluffing, I believe I had appeared the young aggressive kid. I feel I played this hand pretty poorly and this was the end of a long session, just wondering how badly I messed up or if I feel worse that I didn't check behind the river when I was counterfeited.