Sometimes you’re cheated. Sometimes you’re fairly beaten. Sometimes you’re just unlucky.
Whatever the reason for you losing, don’t bemoan your fate.
If you were cheated, learn from it so you’re not cheated again.
If you were beaten fair and square, learn from it so you’re better next time.
If you were unlucky, suck it up, and keep trying until you get lucky.
Don’t be a bad loser.