The general understanding of this verse is that things are generally created in pairs (for instance, positive and negative, matter and antimatter, light and dark, or male and female), and that one of the signs of Allah is that human beings marry and form a pair in order to become more whole than they would be individually.
However, it is not usually taken to mean that all human beings are specifically created with a soulmate or "pair" whom they marry in this world. Indeed, some people have more than one happy marriage in their lifetimes; others are miserable in their marriages!
Marriage can be destined and can be a matter of free choice; matters of destiny are not usually clear. Some people misuse the idea of destiny and marriage to cover up socially unjust practices (for instance, not allowing their children to marry someone of a certain race, culture, family, or profession) and then saying these restrictions are "destiny". At the same time, it does seem that sometimes some people are destined to be together or destined not to be together.
However if you are happy with your husband, I hope you will be able to be together in the Hereafter!