وَلَقَدْ نَزَلْتِ فَلَا تَظُنِّي غَيْرَهُ مِنِّي بِمَنْزِلَةِ الْمُحِبِّ الْمُكْرَمِ
You occupy in my heart the place of an honoured beloved; do not suppose that my feeling is otherwise.
Laqad strongly affirms the statement. Nazalti is not a literal descent here but a figurative taking of a settled place in the speaker’s affections.
Fa-lā taẓunnī prohibits a mistaken assumption by a feminine addressee. The phrase bi-manzilati al-muḥibbi al-mukram expresses the honour attached to his love.