Their relationship has soured. SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh.
עס איז דורכגעלאָפֿן צווישן זיי אַ שוואַרצע קאַץ.
Es iz durkhgelofn tsvishn zey a shvartse kats.
A black cat has run between them.