The fiancé is not totally wrong, She did cassualy accept a drink from a stranger, so if anything, she is not a good wife material, more like the cheating wife plot
Im more on the fiancé side, she probably did love him that much, and probably that other women does.
Although is not good to have an affair while engaged, if she was so easly seduced by that guys charms, maybe the fiancé saw that coming, We dont know their backstory. Possibly he doubt her fellings for him and he found a woman truly liked him.
dont @ at me going simp defending that thot, on your white knight side. Everyone defending that girl dont really understand this white knight metality
Im all for fluffy / wholesome romance, but new engaged couple was bound to fail, neither the guy or girl are any good