Shelley White, 25, faced huge court costs after being convicted at Leeds Crown Court of kissing the boy, one of her pupils.
White, of High Green, Sheffield, denied the accusations, claiming the boy, who cannot be named for legal reasons, made advances towards her and physically assaulted her.
Judge Sally Cahill delayed passing sentence, but said White would not be going to prison. She told her: "You have throughout this trial portrayed yourself as a victim. It's fair to say that you are a victim, but not a victim, as you put it, of your friends, the boy, and the press, but a victim of your own stupidity."
The judge expressed concern about how much the case had cost because White had "chosen to take it this far".
The court heard how on two occasions White put the boy in detention and kissed him in the classroom. Later she sent him to a store cupboard to find some paperclips and kissed him again.
White was found guilty on three counts of abuse of trust by sexual activity with a child. The jury of seven women and five men took just over 11 hours to reach majority verdicts.
John McLeod, corporate director for education and culture at Wakefield District Council, said officials were in discussion with the school on the next steps.