Very unlucky that, however it's one of those hands it's so hard to get away from
Personally i hate KK in any position but once you've called a raise
(300) and a re-raise to 700 your now in a 3 way handed pot !! The thing now is you have to hit the flop (after a raise and a re-raise)
Board flops 2 8 3
(i know you have a big hand still with a big over pair but the betting had every red light flashing before the flop and now you've missed with your KK
.. I know this sounds harsh but you have committed only 700 you still have 3605 .. when the bet 2100 came after a check (could be trap checking) this is the point you've decided to gamble and move all-in !! The point is it was a gamble, you could have passed and waited for a better opportunity when you are making the betting from position not setting yourself all in against a possible two players and hoping to hit a K when they both may have already made a 'set'
All that said, it is a hard play to put the hand down but in this scenario all the warning lights were flashing before the flop !!
The other thing is this, what i might have done (ask yourself this honestly) If in your mind you were calling a raise and a re-raise, where you ever going to pass !!
Because if not then why not move all-in pre-flop
Because if you wanted to see a flop and you hit a K your going to call any bet or get all your chips in, so once you've missed with all this action before you should have passed when the check and then the big bet came out, he either had to have AA or he hit the 'set' .... Me, I'd have gone all-in pre-flop possibly but i would have passed with that board and that action. You took a shot (gambled) and missed....unlucky mate it happens live as well, i went out of the APT live tourney with your cards ..i small raised (button) ..BB re-raised (doubled) ...I moved all-in with my KK he called and had the AA
..I then had the walk of shame 1st out of the tourney after 10 mins... but i took a shot an lost...I gambled he would pass maybe AK or another pair but that's, as they say, POKER !! glk mate