What was supposed to be an eristic debate has turned into a semi-philosophical enquiry into the nature of a philos ("friend"), being the one who loves or the one being loved, or whether the partners in such a relationsihp in which only one loves are both friends or both not friends. Socrates exploits to confusing effect an ambiguity in the word philos, which as an adjective (its original usage)  is passive ("beloved") but as a nount is the ambiguous "friend".