$.10-$.10 No Limit HE (Real) 10 players. Players unknown
UTG: ($.85 in chips)
UTG+1: ($1.90 in chips)
UTG+ 2: ($15.10 in chips)
MP1: ($2.90 in chips)
MP2: ($31.65 in chips)
MP3: ($17.55 in chips)
Hero CO: ($2 in chips)
BU: ($12 in chips)
SB: ($6.60 in chips) Post Blind ($.05)
BB: ($3.40 in chips) Post Blind ($.10)
Pre-Flop :
4 folds, MP2 calls ($.10), 1 fold, Hero CO bets ($.50), BU and the Blinds fold, MP2 calls ($.40)
Flop : 10 
A 
K (Pot $1.15, 2 players)
MP2: Check
Hero: Bet ($.80)
MP2: Call ($.80)
Turn : [10 A K ] 6 
(Pot $2.75)
MP2: Check
Hero: Bet ($.70) and is All In
River : [ 10 A K ] K
Dealt to Hero: A J
Dealt to MP2: K 
8
MP2 was underdog all the way and hit his third K on the river.
1. Did I have any way to protect my hand? Should I go all in post flop instead of calling 2/3 of the pot? Note that there was a possible flush draw and a straight draw.
2. I know for sure that MP2's move (calling my bet) pre flop was wrong. I also think that he was wrong when he payed my bet on the turn. What do you think?
you are commited anyway so push it for max protection and fold equity