Explanation For Terminology 'Fasad Fil Ard'
Fasad fil ard is a quranic term intended to define people who r creating mischief in land either by spreading social injustice, propagating moral sins, or challenging rule of an Islamic government. It can’t be used to define any behavior that’s unislamic but in an unislamic society. The case u described, such a person can not be ruled as such. However plenty of other things have to be considered like how the consent of the opposite party obtained etc But it’s all an academic exercise since this term doesn’t exist in the legal system at present