Dreams about a partner, especially involving activities like exercising, can carry various meanings. In your case, the treadmill might symbolize a sense of routine, progress, or even the effort being put into the relationship.

Seeing your boyfriend running could suggest that he is working hard, either on himself or on aspects of your relationship. It might also reflect your feelings about his commitment to personal growth or the dynamics of your relationship. If you felt positive emotions during the dream, it might indicate support for his efforts. However, if you felt anxious or concerned, it might symbolize worries about how much effort is being reciprocated or whether he feels stuck in certain areas of his life.

Consider your current feelings and relationship dynamics to gain deeper insight into what this dream might mean for you.