Safe to assume he's a donk? yep

Full Tilt No-Limit Hold'em, $2 BB (6 handed) Converter Tool from (Format: Bet The Pot)

MP ($200)
CO ($230.85)
Button ($200)
SB ($201)
BB ($346.45)
Hero ($254.45)

Preflop: Hero is UTG with , .
Hero raises to $7, CO calls $7, 3 folds.

Flop: ($17) , , (3 players)
Hero bets $14, CO calls $14.

Turn: ($45) (3 players)
Hero bets $32, CO calls $32.

River: ($109) (3 players)
Hero bets $105, CO raises to $177.85 (All-In), Hero calls $72.85.

Final Pot: $464.70

Hero has (flush, jack high).
CO has (one pair, aces).
Outcome: Hero wins $464.70.

Other than the river shove, it seems fine to me.