Knowing a Family Member About the Husband's Bad Character and What Should Be Done

Question
If the wife has no children and is uncomfortable with her husband due to ongoing problems with him, the husband's mother's interference, and the husband using blasphemous language, and he has relationships with girls, and he swore on the Quran that he would not communicate with girls, but then he contacted his wife's sister through Facebook without knowing who she is with obscene and disrespectful language, should she inform her sister so that she can ask for a divorce from him, and she has already told her mother about this?
Answer
I say, and with God's help: It is better not to inform her sister about this, and the decision is for her sister to continue the relationship with her husband or not. If she fears for her religion and her future with him, to the extent that life with him is unbearable, then it is better to separate. And God knows best.
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