What was the reason for Saigo's quick divorce from his first wife, Ijuin Suga, after only two years?

Saigo Takamori married three wives in his life. 1 Ijuin Suga 2 Akana 3 Iwayama Ito (Saigo Itoko) The first was a woman called Ijuin Suga, who was played by Hashimoto Ai in the 2018 taiga drama "Saigo Don." In "Saigo Don," she was played by Hashimoto Ai (illustration by Koku Hiro). Unfortunately, the two were divorced at an early stage. After all, their married life began around the time Saigo's turbulent life began, so it is highly likely that …