Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.
In Islam, the wife is entitled to her earnings or wealth; the husband has no right to take or demand or use it unless she freely gives it to him. However, he is obligated to provide for her and maintain her.
Hajj is fard only on those who have the financial means to pay for it; however, if your wife is rich and she wants to take you with her for Hajj, you can do the Hajj, and she will also gain extra rewards for it.
If he did perform Hajj through her funding, he has fulfilled his duty, and she receives rewards for the same as well.
Allah Almighty knows best.
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