All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
The husband is Islamically ordained to have good marital relations with his wife as Allah Says (what means): {And live with them in kindness.} [Quran 4:19]
Living with the wife in kindness is achieved by keeping good company with her, not causing any harm to her, and having good treatment with her as stated by as-Sa’di in his Tafseer (interpretation of the Quran).
You have done well, indeed, as you reminded him that this was the guidance and practice of the Prophet with his wives.
Indeed, the Prophet used to treat his wives with kindness and affection and not with harshness and roughness, and he did not consider one of them as a maid at home; rather, he used to help her in the house chores.
Al-Aswad said: "I asked 'Aa'ishah 'What did the Prophet use to do in his house?' She replied: 'He used to serve his family, and when the time for the prayer was due, he would go out for the prayer.'" [Al-Bukhaari]
It is with such cooperation that happiness is achieved in married life.
Therefore, we first recommend you to be patient and strive to avoid anxiety and tension. It is by doing so that you may determine the appropriate behavior that is expected to achieve the benefit and preserve the harmony and entity of the family.
You should continue in advising him in a good manner. You may seek the help of some of his friends who may influence him. Also, you should supplicate Allah to guide him as the hearts are in the Hands of the Lord of the Worlds and He turns them as He wishes.
For more benefit, please refer to Fataawa 108187, 134654 and 249214.
Allah knows best.