I had used the word “partner” before. I’d like to say a few things about that.
By the way, it is not a word you should ever use with him, unless he invites it, but there is a truth in it, an understanding of something that can be helpful to you as his slave girl.
So, understand that I mean partnership in a different way than equality.
To be clear, you are not his equal. That is partly the point and pleasure of D/s. Moreover, you are not equal to his friends or colleagues or even passing acquaintances. If it is the nature of things with him that he has lovers, you are not equal with them either. You are kept as his property. It is your place in his life. It is what you agreed to.
Your owner has needs to be fulfilled. Dominant needs — to control you. Sexual needs, perhaps — to use you as a sex thing at his beck and call. Life needs — services for you to do for him. In all of this, you are a container, and he pours his urges and urgencies into you, sometimes literally, for you to sate and satisfy them. It is a partnership of sorts — an unequal partnership in which you provide yourself to attend to his being, and, by using you, he touches your deepest submissive places.
My advice is for you is just this: do not expect him always to define and conduct your slavery. Sure, follow his lead and obey what he has for you to do. But do not think of your slavery as his sole responsibility.
The misconception about D/s is that slaves are to be utterly passive. We are obedient, but that doesn’t mean we’re limp and lifeless. Actually dominants treasure personality and initiative.
So you should be seeking what your slavery should be to him. Find his need in the moment, ask what you can do for him, and offer yourself as a receptacle for whatever he wants to pour into you.
Ultimately what you have is a partnership. Not a partnership of status. But a partnership of use and service and submission.