Is this the play of a naive player??

[Bruise Pristene]

ok holding K6 flop comes KK3 I raise, players all fold except one who calls next its KK36 in middle, I raise player reraised, I called next its KK36J I bet, he goes all in, I match him, he turns over KJ is it unlucky, or naive of me not spotting the Jack on the board gives a potential better full house than mine? surely (well it was my thinking) that holdin a full house has me in a strong position and I should bet aggressively, but this has knocked my confidence

[Bruise Pristene]

Re: Is this the play of a naive player?? by the way I should say I was in big blind position, so checked, otherwise I wouldnt have played K6