I just have a little laugh to myself and say "Oh well, That's Poker!" I once played a full house in a hand against a friend, and when he turned over a bigger full house to take me out of the Tournament game, I was devastated but I still laughed about it.
Later we were both involved in a hand on the same cash game table, and I hit a full house again and he shoved all-in, I called and he turned over a full House, I turned a bigger one and Laughed saying "What goes around, comes around buddy" He saw the funny side though.
Revenge is sweet!
You have to forget, the bad beats and suck-outs, as they happen all the time, it is just part of the game, if you let them get the better of you then you would stop playing Poker, and for me that is not an option, not when I have so much fun playing.
When the fun Stops, STOP!