Should a woman get divorced from her Sunni husband when she comes to know after her marriage that the Shia sect is the right one to follow?
Divorce is not the way in such cases but to try to explain to him the facts which you discovered about the Real Islam, so that he may realize as well. If he refuses the evidence and insists on that, you can continue with him as far as he does not obstacle or disturb your religious freedom or practice.
I advise you to keep on explaining and giving him useful information which can help him to know what he does not.
Wassalam.