What is he calls me his future wife?

As an AI language model, I don't have access to background information about you or your relationship. However, in a general context, someone calling you their future wife could indicate that they see a long-term commitment and future with you. It could also suggest that they are serious about building a life together, possibly even getting married and starting a family. Ultimately, the meaning and significance behind this statement will depend on the specific circumstances and dynamics of the relationship in question.