This question is not about what to do about it nor about the first time. Rather my question is to find out from other guys about the recurrence of sadistically hurtful verbal insults directed at them from their SO or Ex. Once a day, week, month, year or never.
Lets say she tell you during a fight that shehates youoryour child is actually someone elses and you tell her that you never want to hear that again. Then she apologizes but says the same thing again when she is angry.
“your child is actually someone else`s” 
Damn that is just messed up.
Welcome back first of all…
Well i have never been in any kind of relationship, so i am not in a position to answer your question. But if my future wife says somthing that i do not want to hear… i will definitely talk to her and make it clear to her that what she is doing or saying is hurtful and it’s not wise to use such extreme insulting words that can turn off anyone let anole your partner…
At the same time i will keep an eye on her to check if she is really speaking the truth ( about someone else’s child), because sometimes truth comes out when you are angry.
Yikes! Telling someone that you hate them is bad enough, but it’s still not surprising to hear such a remark in the heat of anger. But telling your husband that his child is actually from another man is not normal. Also, I wonder if the wife realizes that such a comment is more of a gaali to herself and her own character than to her husband. Itnay josh main aa kar keh rahi hai k bacha tumhara nahi hai…and it’s like uhmm HELLO BIBI…you’ve just pointed out to how bad-challan your own character is if you have indeed committed adultery. Talk about dropping the hammer on your own foot. 
If the husband was smart, he’d point this out to her. Dekhna, she won’t use that come-back again. 
Although, I hope he’s sure that the child is really his. 
The question came to my mind due to various reasons and my intent was not to find a solution. But to find out the prevalence of such behavior in other couples.
I realize men won`t share being on the receiving end of such behavior so I sometimes hope GS had an option with which OP could allow anonymous replies for particular posts.
How it is helpful to know the re-occurrence of this behaviour from other couples?
Does it validate that others are also in similar situations and make someone feel better about their own?
Does it make the feeling of hurt, neglect and misery go away?
Not sure this is going to be a productive exercise.
Agree with Illuminate. The above question that she posed is actually the first thought that I had when I read this question.
What is wrong is wrong. The wrongness of it does not depend upon frequency. To curse someone is wrong the first time and it will be wrong the second time and the tenth time.
You have not told us anything about the husband. Has he done something that is causing his wife to react so strongly? There are usually two sides to a conflict.
Telling someone you hate them is hurtful but it’s also a vague comment; it doesn’t express exactly why the person is upset at you. It seems like the wife struggles with communicating her feelings in a clear way. She needs to tell her husband exactly which actions of his are troubling her. She apologizes for her comments so it shows that she does have an awareness that they are hurtful, but the fact that she repeats them again…indicates that she doesn’t know how to communicate properly…and err…also it makes you wonder who da baby-daddy is.
Not common phrases at all, as far as I know.
This reminds me of a male client of mine where his wife had made a very hurtful comment about regretting having kids with him. It was not ok. Comments like that are just not okay. I can understand the need to want to know how frequently that happens. I can understand the need to know that the individual is not alone (and I assure you these things happen). At the same time, these kinds of deeply hurtful comments are absolutely not okay.
It is important to have a very clear conversation with one’s partner if such comments come up and it is extremely important to implement boundaries. You are supposed to be trusting this person with your life and they are not making it easy. If the person does not stop making such comments, out of anger or what have you, I would suggest seeking couples counseling. The perpetrator is forgetting that they are a team, not an enemy, and you cannot have someone so close turn into an enemy.