Deep in mtt, top ten stack. KK vs chipleader

[Margaud]

I apologize as I dont have the HH for this. It occurred on PokerHeaven's 100k gtd this Sunday. PokerHeaven doesn't have a conventional HH (they save an html file to local hard drive).

I was able to grind my way to the middle stage of this tourney and then went on a small heater to get up to #6 in chips with 174 left (80 pay I think).

-I'm on the button with KK.
-chipleader has my easily covered sits 2 spots to my right. I have no reads on him as he was moved to my table like 2 hands ago and this is his first action on my table.
-MP limps
-guy behind him limps
-chiplead limps
-I raise 5.5xBB
-blinds fold, 1st 2 limpers fold
-chiplead reraises approx 2.5
-I reraise (4bet?) him 3x
-CL pushes, I call.

He shows AA and my miracle K doesn't hit to send me out.

I thought to myself for a brief moment, "uh oh...limp reraise...AA?!? hrm..could be pocket pair and he think's I'm stealing the limped pot". By time he pushes, I'm more than pot committed and make the call confident I'm behind but praying I'm not.

I played very well up til this point and picked my spots carefully, negotiating the field to build up a decent stack. I'm extremely disappointed for busting like this but can't help but wonder if there's anyway anyone can convince me I should have folded that hand.

Comments? Again, sorry for not having a proper HH.