Mi principal duda seria en river; no creo q deba donkear , pero pagar esa bet?

Poker Stars, $0.10/$0.25 No Limit Hold'em Cash, 8 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.
SB: $27.46 (109.8 bb)
Hero (BB): $41.30 (165.2 bb)
UTG+2: $29.39 (117.6 bb)
MP1: $43.42 (173.7 bb)
MP2: $27.70 (110.8 bb)
MP3: $57.93 (231.7 bb)
CO: $8.52 (34.1 bb)
BTN: $49.55 (198.2 bb)
Preflop: Hero is BB with K
K![]()
2 folds, MP2 raises to $0.75, 2 folds, BTN calls $0.75, SB folds, Hero raises to $3, MP2 calls $2.25, BTN folds
Flop: ($6.85) A
Q
3
(2 players)
Hero checks, MP2 bets $3.50, Hero calls $3.50
Turn: ($13.85) 9
(2 players)
Hero checks, MP2 checks
River: ($13.85) 2
(2 players)
Hero checks, MP2 bets $7.50, Hero folds
Results:
Spoiler
$13.85 pot ($0.71 rake)
Final Board: A
Q
3
9
2
Hero mucked K
K
and lost (-$6.50 net)
MP2 mucked and won $13.14 ($6.64 net)