Praise be to Allah.
We ask Allaah to make us and you among the people of Paradise, with all our families and loved ones. If a woman’s husband enters Paradise along with her, then he will be her husband there too, but if he is one of the people of Hell, or if the woman did not get married in this world, then she will get married to a man among the people of Paradise.
Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) was asked: If a woman is one of the people of Paradise and she did not get married in this world, or she got married but her husband does not enter Paradise, who will she be with?
The answer is based on the general meaning of the verses in which Allaah says (interpretation of the meaning):
“Therein you shall have (all) that your inner‑selves desire, and therein you shall have (all) for which you ask”
“(there will be) therein all that inner‑selves could desire, and all that eyes could delight in and you will abide therein forever”
So if a woman is one of the people of Paradise and she did not get married, or if her husband is not one of the people of Paradise, when she enters Paradise there will be men who did not get married, and those men will have wives from among the hur al-‘iyn and wives from among the people of this world if they wish.
Similarly with regard to the woman who did not have a husband, or who had a husband in this world but he did not enter Paradise with her, if she wants to get married then she will inevitably have what she desires, because of the general meaning of these verses.
From Majmoo’ Fataawa al-Shaykh Ibn ‘Uthaymeen, 2/52
And Allaah knows best.