100NL top purr + turn second nut fd

guy is some random 34/21, but not too passive
but like even though that card gives us outs, he has flushes all over his range and if he has a set or a flush we can't call, can we? even though it's like half pot we have like 7-8 outs unless he has the nuts in which case we're boned

Full Tilt No-Limit Hold'em, $1.00 BB (6 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

Button ($71)
SB ($78.50)
BB ($103.65)
UTG ($140.25)
MP ($142.40)
Hero (CO) ($100)

Preflop: Hero is CO with Q, A
2 folds, Hero bets $3, 2 folds, BB calls $2

Flop: ($6.50) 2, 8, A (2 players)
BB checks, Hero bets $4, BB raises to $18.50, Hero calls $14.50

Turn: ($43.50) 5 (2 players)
BB bets $23, Hero?

Any bet sizing reads?

His flop c/r is mega huge, and I'd imagine from most people on this type of board they are trying to make it seem bluffy/drawy when they really have two pair+.

Unless he's been really active I might just fold flop to this strong sizing.

hmm it's really strange that he would raise so much on the flop and then bet 1/2 pot on the turn, i'm not sure if he's even trying to do anything with his sizing but it looks like a flush