5/10 NL hand...questionable line what do you think?

[Ben5505]

Hero in the BB with 3d4d. 5 handed game.

UTG raises to 20...3 calls, and I call 10 more bucks as well.

Flop comes----- As 5c 6s

SB leads with a 20 bet...I call 2 folds and button raises to 80. SB calls and I call.

Turn card is 2c---SB checks and I donk bet 300 becuase I didnt want to give odds for the flush to draw. Button folds, SB calls.

River is an A and SB goes all in for his last 290. I have him covered with 301 left and make the call.

What do you think of this line? Did I make a bad call?