en_tn/1co/07/36.md

not treating his fiancée with respect

"not being kind to his fiancée" or "not honoring his fiancée"

his fiancée

Possible meanings are 1) "the woman whom he promised to marry" or 2) "his virgin daughter."

They should marry

Possible meanings are 1) "He should marry his fiancée" or 2) "He should let his daughter get married."