Your presence in your lover's life helps them to find the role in society that's right for them. Somehow, you open them up to new opportunities; maybe you introduce them to influential people who can help them get where they're going, or maybe you just help them to define their role in the world better than they've ever defined it before. You each have something unique and valuable to contribute to society, and this relationship helps you to focus on what that is, and to develop it within yourself.
You inspire your partner by being yourself, and by focusing on your own role in the world; you serve as an example to them in terms of what's possible and what's important. They might follow in your footsteps, at least energetically if not in the actual work that you each end up doing for the world. You are particularly inspiring in the way that you handle yourself in public and how you conduct yourself socially and in business, and your partner really draws a lot of good information and techniques from that. Even if they have always tended to hang back and reserve their energies, this relationship teaches them to be comfortable with taking a more public role and offering their talents to the world for the greater good.