What would you do? (Please Comment)

I am turning to the IPP nation for help with my game. I'm truly in crisis here. It seems, for the last couple of weeks anyway, every time I bet big or go all-in I lose. Here's the Texas Hold 'em situation that prompted this post.

Four out of the five cards on the board are Hearts. I have the King of Hearts and one caller. I'm slowplaying my high pair of K's with a decent kicker. So far I have checked then called every one of his bets which have been respectable amounts but nothing scary. This is a small stakes game and neither of us have big stacks.

Be my poker caddy and tell me what I should do. Please hurry. The clock's running (on my sanity).

--PB--