Bad Beat in Heads Up

I finally cashed in a 45 player SNG.  I made it all the way to heads up play.  I had a slight  chip lead and had AT on the button.  I raised and my opponent called.  The flop was TT4.  He bet and I raised.  He moved all in and I called.  He showed 88.  I am in good shape to take down the tournament until the river hits.  An 8!!
He makes a full house and doubles up.  I am crippled.  I moved all in a few hands later with A7.  He called and showed AK.  Oh well... what can I do?  I took down 2nd place for $11.25.  My bankroll is now at $64.48. 
I believe that my tournament play is improving and I have found myself folding hands that I previously would have played.  Tournament play is all about protecting your chips and I am very careful about which hands I am willing to risk my chips with.