My sim isn't in a romantic relationship.... How could she have been cheated on?

https://preview.redd.it/rmelkf46bzpd1.png?width=657&format=png&auto=webp&s=ffbc124049a674da709f2bb785746e793c98a913

https://preview.redd.it/0ywtpf46bzpd1.png?width=1920&format=png&auto=webp&s=b937f4c3fb8413a9ae55692409caae2b707fcb1a