SPOILER!!!!

WARNING SPOILERS







So basically, There are some supernatural/religious elements in the story, as is hinted by the characters' Biblical names: "Eve" and "Azazel." I believe Azazel turned out to be some kind of fallen angel who had turned into a demon. Eve would occasionally have dreams about a dark-haired man, who was also Azazel even though the appearance was different. Azazel had always loved Eve, and they ended up together in the end.

Also, Eve never consummated the marriage with her first husband. The husband would sometimes summon Eve to his bedroom, but there would always be a female prostitute waiting in the bedroom as well. So Eve would just have to sit there and watch the husband sleep with the other woman.

It's only after their divorce that it's revealed that the prostitutes were actually sent there by Azazel. The husband slept with the women because he assumed it was Eve who had ordered them. So he went along with the situation because he figured that was Eve's wish. But the husband wasn't really happy with the situation either and that was part of why he decided to dissolve their marriage. After their divorce, the husband tells Eve that he'd actually loved her. So her ex-husband wasn't really a bad guy either, and Eve actually ended up having a friendly relationship with him afterwards, though he was a bit broken-hearted that she chose Azazel over him.

Eve: "I like Azazel."
Ex-husband: "Aren't you a bit cruel? [...] Why is he good?"
Eve: "Azazel is handsome and desperate."
Ex-husband: "I am handsome too. I was desperate."

At the end of the conversation, they share a hug and part on good terms.