I am a beginner so please take this with a grain of salt - I'd say that what connects him to you is something sexual, either he wants sex with you or is with you mostly because of sex. In a way he sees you as someone who could be 'of service' to him.
I think that his co-significator can be the Sun and yours Venus so it's worth a while to see their relationships to dig a little deeper.
Once again, I am a beginner, this does not have to be accurate at all