($6) Two pair on a monochrome flop. Lost in action

[Pocketbear]

PokerStars Tournament, Big Blind is t20 (9 handed) Converter on pregopoker.com

UTG (t1500)
UTG+1 (t1180)
MP1 (t1500)
MP2 (t2170)
MP3 (t1490)
CO (t1340)
Button (t1460)
SB (t1360)
Hero (t1500)

Preflop: Hero is in BB with A[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/heart.gif[/img]
<font color="gray">UTG folds</font>, UTG+1 calls t20, MP1 calls t20, <font color="gray">MP2 folds</font>, <font color="gray">MP3 folds</font>, CO calls t20, Button calls t20, SB calls t10, Hero checks

Flop: (t120) 5[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img] (6 players)
SB checks, <font color="red">Hero bets t75</font>, UTG+1 calls t75, <font color="gray">MP1 folds</font>, <font color="gray">CO folds</font>, Button calls t75, <font color="gray">SB folds</font>

Turn: (t345) 8[img]/images/graemlins/diamond.gif[/img] (3 players)
Hero checks, UTG+1 checks, <font color="red">Button bets t140</font>, Hero calls t140, UTG+1 calls t140

River: (t765) T[img]/images/graemlins/heart.gif[/img] (3 players)
Hero checks, UTG+1 checks, <font color="red">Button bets t280</font>, Hero calls t280, UTG+1 calls t280.

Should I check/fold the turn? Should I check/fold the river? Both bets from button are pretty gay, but I have no tell is it a sign of the weakness or the strength...

[Oxota]

You put yourself in a very difficult situation by betting so little on the flop...that's not even 2/3 the pot. Throw in 120-140. I don't see where you are getting the idea that you are behind, I doubt anyone is slow playing the flush like that against those raises. No, you should not checkfold turn, you should probably bet 2/3 pot, but the situation would have been different if you bet more on the flop I think. Anyways why do you think you are behind on the turn? Your bet was weak and the called it, then proceeded to bet less than half the pot on both of the following streets after your check.