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.
It is good that your husband is keen on being kind and dutiful to his mother and help her with some of his money, even if she does not need it, and to comfort her heart.
This is kindness and dutifulness to the parents and this is a great matter, especially to the mother, as we have already highlighted in Fataawa 87019 and 84942, so please refer to them. We hope that, because of this dutifulness, blessing and goodness will prevail in your family.
However, despite what we have mentioned about the excellence of kindness and dutifulness to the mother, it is not permissible for your husband to be unjust to you or wrong you because of being dutiful to his mother.
He must fulfill the rights of his mother and fulfil your rights as well. Among your rights upon him is to spend on you in reasonable terms, namely to provide you with what suffices you of food, drink and clothing. He must also provide you with an independent accommodation, even if it is a rented one. You are not Islamically obliged to live with his mother or any of his relatives. Also, he does not have to obey his mother if she prevents him from providing you with this accommodation. Additionally, you do not have to spend from your own money on yourself or pay part of the rent, unless you do so with your own free will.
Making you happy and allocating some time for you too to express sympathy and enjoy times of friendliness and to have pleasant moments with each other; this is part of the good marital relatioship towards you as the Prophet used to do with his wives.
We advise you discuss this matter with your husband in a soft and gentle manner in light of what we have mentioned. However, you should choose the most appropriate time to speak with him about this.
Supplicate Allah earnestly to guide him and make him regain his senses. It is also acceptable to seek the help of his relatives and friends to speak to him about this if necessary. However, it is better, whenever possible, to solve your problems with him without the intervention of any outside parties.
Allah knows best.