What is the ruling on some girls saying, "I have a brother my mother did not bear, and he is excellent," while speaking to him with politeness and respect, but within limits?

A woman's conversation with a non-mahram man without need is a door to temptation and corruption. The claim that the relationship is an innocent brotherhood is false. Girls must cut off relations with non-mahram young men and not speak with them without need, because these relations are unlawful and a path to falling into forbidden acts.