Secret marriage

AsalamoalikumI have question about marriage. I got engaged more than two years ago but could not get married because one of my cousins who called my fiance's parent and told him that I was engaged with him which is not true and threatened him. Prior to this instance my cousin also intervened and threatened the family where I was getting engaged and that engagement ended too. Later on my fiance's dad put a condition unless my cousin and his family agree to the marriage, it wont take place while my fiance wants to marry me but he thinks unless his father agrees the marriage cant take place. And by each passing day we are getting closer and we fear we may commit zina. We are getting old and I suggested to my fiance we should marry in secret which my parents approve of (and in their presence).Both our families have done istikhara and have seen positive dreams. Both me and my fiance don't want to marry elsewhere.We both just want to get married soon, as we don't want to persist in sins. I don't think I can find a better guy than him as he has both good character and is religious. So I need your guidance on the issue if he marries secret. Considering our situation, is it permissible? JazakAllah khair