«وَلَا أُمَالِي مَنْ يُحِبُّ مَالِي»
I do not support someone whose affection is for my wealth.
Umālī means siding with or supporting someone; mālī is “my money.” Their close sound produces an elegant cadence, but the criticism targets a relationship driven solely by gain.
He is not proving that anyone who benefits financially must be unfaithful. His argument concerns affection in which wealth, rather than the person, is the real object. This gives a contrary angle to the first traveller's expansive generosity.