男心と秋の空
Meanings
1
a man's heart is as fickle as autumn weather
Proverb comparing the changeability of a man's romantic feelings to the unpredictable autumn sky. Often contrasted with 女心と秋の空 (a woman's heart is as fickle as autumn weather).
See also: 女心と秋の空
As the saying goes, 'a man's heart is as fickle as autumn weather,' and his feelings changed in no time.