All perfect praise be to Allaah, the Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
Issues that involve mutual denial and litigation can only be concluded and settled by a legitimate judge or by those who may act on his behalf. What we can tell you now is that the one who separates from his wife through divorcing her three times, and she is sure of it, then it is illegal for her to let him enjoy her sexually and she must stop him from that as much as she can.
However, regarding the pronunciation of divorce three times at once (as in the questioner’s case), there is disagreement about it. The question is whether it is an irrevocably divorce with major separation, according to the majority of scholars, or rather is it a revocable divorce. The latter is the opinion of some well-versed jurists and has been issued by many Fatwa authorities. Hence, we sincerely suggest referring this issue to one who can settle the dispute in the country of its occurrence, considering that the Islamic centers can take the place of legitimate judgment in a country that has no judge. For more benefit, please refer to Fataawa 82330, 155573 and 82541.
In conclusion, we draw attention to these two points:
First, the husband's threatening to kill his wife or accusing her of infidelity without any evidence is considered evil treatment of the wife, as well as weakness in religion and bad moral character.
Second, spending on the wife and children is the husband’s duty. If the husband is stingy and the wife finds his wealth, she may take what she needs of it, even without his knowledge. If she cannot find his wealth, then she may raise the matter to an Islamic judge or whoever may act on his behalf in order to require the husband to pay. If he still does not pay, the judge can separate them if that is her choice. For more benefit, please to Fatwa 123761.
Allaah Knows best.