The boyfriend called your wife means that he has taken you as his other half of life in the bottom of his heart, looking forward to marrying you as soon as possible. If you also think of him, you can call him husband, let him understand that you have determined that he is the person you will be with for a lifetime.
The boyfriend called your wife means that in his heart, he has long silently regarded you as the other half of his life, looking forward to marrying you as soon as possible, and walking into the beautiful marriage hall hand in hand.
He knows that calling you like this is responsible, and he wants to shoulder this responsibility, whenever he sees you, his heart is very sure of this idea, proving that he has long taken you as "one of his own."
If you are in love with the other party, the feelings have reached a certain degree, and also identified him, calling him a husband is not impossible. But if you are still in the early stages of love, he calls your wife but you are psychologically stressed, at this time you can tell him his idea, using some relatively more acceptable small nickname better.