Woman, 19, reveals how she caught her fiance cheating

Arellano now lives by the old adage 'once a cheater, always a cheater' and wants to protect other women from infidelity. She opened up about her experience on TikTok in her now-viral video. 'This is a 100 per cent fool-proof way to find out if the man you're considering marrying is gonna cheat on you in the future,' she said. 'One word: prenup.' Arellano explained that her ex cheated on her when she was pregnant with his child, but she stupidly decided to give him another chance.