When you lose, don't lose the lesson.
There are times you do everything right and still lose. However, many times if we "step back" and look, we can see something that may have been a factor.
It may be as simple as, playing when you were tired. It could be you had a fight with the wife (boss or co-worker), before you came to play and didn't really have your mind on the game. Did you drink too much. (drink too much booze and you are sure to lose).
Were you supposed to be at the kids ball game in half an hour (or meet the wife for dinner) and tried to force a win.(over bet)
Did you let another player get to you. A few mistakes here and there, can equal a losing session.
Midnite