Dude in the first chapter Hinata literally threatened to destroy her marriage, but the funny thing is her marriage is already over. Is all that's left is for the husband to find out, and cut her out of his life, and divorce her. Bitch literally did it all to herself. There's no coming back from this. She literally states no one, and nothing can turn her on any more other than Hinata. Means she doesn't show her husband any affection at all. Let alone tells him she loves him. Lets be clear here. She doesn't love her husband.
He likely has noticed these subtle changes with her, but he can't say for sure. She shows a fake smile for him, puts on fake attitude towards him, but is still cold towards him. She never approaches him for affection, nor askes for affection. She probably doesn't even go on dates or does valentines with him any more. Their marriage is done. Just needs to catch them in the act, and immediately file for divorce, and move on without her. She does not deserve his love.