1)
What is the meaning of "l'Mere'ehu"?
1.
Rashi, Radak citing Targum Yonasan: It is one of the friends who engaged in the nuptial feasts.
2.
Malbim: She had a Bris with the man. Refer to 14:20:2:2.
2)
What is the meaning of "Asher Re'ah Lo"?
1.
Radak: Shimshon had taken him to be a friend.
2.
Malbim: She was his friend; he loved her before [she married Shimshon].