Lila spreads lies about marinette everyone believes them and adrien believed them.. But one day adrien finds out that the things lila had said marinette has done was lies and adrien was the only one who knew this, but if he did tell everyone, they would still believe Lila, marinette didn't know adrien knew this was lies she thought everyone believed lila adrien got angry at her for doing this to marinette trying to ruin her life. So adrien wanted to take revenge on Lila..