Your lover really wants to achieve success in the eyes of the world, and they're working hard toward that aim. With you in their life, they try to stick to their goals, which is as it should be, but you should both be forewarned -- their methods of sticking to their goals probably put a strain on this relationship that increases over time. They might end up having to devote a little less time to their career goals and a little more time to the relationship if they want it to last.
You, on the other side, might have to put up with frequent separations -- for example, if this person travels a lot for their career. Even if they just have a job that demands that they go to functions where they chat up everyone but you, it could be difficult to deal with. How is their drive to succeed going to affect your love life? If you push to spend more time with them, that could feel like a burden on their shoulders -- but it could also be an important test of the relationship. If you two can't strike a balance, it might end up that you just weren't meant to be in the first place. If this relationship is important to you both, you definitely want to find a balance between work concerns and fanning the flames of your intimate connection.