Foxwoods- 5-10 Live...River Decision..

[GreatKerblini]

End of a 10 hr session at Foxwoods ..5-10 NL playing 8-handed. History with villain. He sees me as tight, aggressive, and willing to lay down pretty big hands with big bets. (i.e. I folded trip kings (J kicker) to K862K rainbow board to another nitty player who 3 barreled in a 3-way limped pot and bet big on river).. Read on villain is solid tag, has not made a play on me yet and havent played any big pots together. He usually C-bets in multi-way pots with hands, and checks when doesnt hit. This hand confused me though.

Game has been pretty loose PF and ive decided to join the fun to loosen up PF to protect my straddle.

Hero ($1700 behind)-UTG live straddles to $20. MP player calls, Villain ($3K) on button raises to $80. All fold to Hero who calls with Qc7c. MP ($2K) calls.

Flop comes Qx5c8x. I check MP checks, Villain says "lets see a turn card".
Turn is 10c. I lead out $150, with TP and flushdraw. MP folds, Villain re-pops it to $400. I think for a while and decide to not re-pop bc struggle to put him on a holding so I smooth. river is 2x. I check. Villain puts out $700 immediately.

Hero? Let me know if you need any more information, thanks.

Comments on all streets would be much appreciated.