Akaza never ate women. This is after the love of his life, Koyuki, was taken from him he was never the same. Akaza only ate male humans. So that's why he never ate females.

But after he saw you, a kind gentle soul, he was reminded of his late wife. He, immediately, knew you were exactly like Koyuki just in a different name and body.

After, he followed you from your friend's house for quite some time and as soon as he saw how your husband treated you, he was furious. So after you and your husband had fallen asleep, he took you from your house and brought you to his safe place to treat your bruises and wounds from your husband.