Your lover may always have had career goals that are focused and ambitious, but in this relationship, they should prepare to have them softened and refocused for the greater good. You bring not only your imagination to the mix, but your innate sense of compassion; you encourage your lover to make career moves that benefit not only them, but also whole groups of people (or animals, or the environment, or what have you). Suddenly, your lover finds that their lifelong desire for personal success has morphed into a desire for understanding of themselves and the world around them, and their essential place in it.
This is not to say that they lose sight of the goals that have been so important to them for so long; it's more that their goals widen and mature. And they definitely do well to allow you to have this influence on them. You bring them a more humanitarian or global perspective that can round out the hard edges of their ambition. You help them to grow spiritually. Even if you're only in their life for a short time, you leave your mark on their consciousness. They should be sure to stay open to your influence, because they stand to gain so much if they do.