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 is His slave and Messenger.
What your husband said that you lost your faith because of trying to commit suicide is not true, a Muslim does not go out of the fold of Islam just because of committing suicide. Although committing suicide does not take a person out of the fold of Islam, it is a grave major sin, and there are texts about it being strictly prohibited and there is a severe threat about it in the Book of Allaah and the Sunnah of the Prophet ; so please refer to Fatwa 84296.
Therefore, you are obliged to repent from your attempt to commit suicide, and you should avoid doing so in the future.
Moreover, we warn your husband not to declare you again as a non-Muslim without evidence as this is a very serious matter. In fact, there are conditions that must be met in order to declare someone as a non-Muslim, and you may refer to them in Fatwa 87963.
Furthermore, it is not permissible for your husband to prevent you from having children because having children is the right of both spouses; for more benefit, please refer to Fatwa 87397.
Besides, it is not permissible for him to talk to a non-Mahram woman. However, he is permitted to marry that woman or any other woman if he is able to be just between you and her. Indeed, there is much wisdom in polygyny; for more benefit, please refer to Fatwa 86818.
Therefore, you have no right to object to your husband’s marriage to a second wife, and if he marries, it becomes your right to ask him to be just between you and her. We have already issued Fatwa 90132 about some advice in regard to a woman who is afflicted by having a co-wife, so please refer to it.
As regards your marriage, if a marriage contract is concluded while fulfilling the conditions of a correct marriage, among which are the consent of the guardian and the presence of two witnesses, then it is a valid marriage. Afterwards, it is permissible to hide it [not making it public] because making the marriage public is desirable and not an obligation. For more benefit on the conditions of marriage, please refer to Fatwa 83629.
It should be noted that if one of the conditions of marriage is not fulfilled, like it being conducted without the consent of the guardian or the presence of two witnesses, then it is a void marriage and it must be invalidated.
However, both spouses may renew the marriage contract as it should be conducted according to the Sharee’ah with the consent of the guardian and the presence of two witnesses. In case the wife has no Muslim guardian, then the Muslim judge or whoever may act on his behalf in non-Muslim countries would marry her off. For more benefit, please refer to Fatwa 88488.
Allaah Knows best.