Your partner wants to achieve some kind of status within society; they want their work to succeed, to gain recognition, so they've worked hard and put themselves out there, and that's normal and natural. But in a relationship with you, you might end up pushing things beyond what's most natural to them. You have a subconscious urge to control them -- to push them to bigger things because you want the notoriety, disregarding what they might want.
You also might look at the successes your lover has accomplished, and glom onto them in order to use their contacts or their experience for your own gain in your career. Of course you don't start the relationship with any ideas of taking advantage of this person; it is a slow process and a subconscious one. You might start to notice that your lover has business contacts that would really benefit you, or that they could really advance your cause if only they'd speak about it at their next function... And that's when the trouble starts. You could make them feel as if you're just using them, and maybe, on some level, you are. Pooling your resources and supporting each other's causes should be an act of free will, not the result of coercion, obligation or manipulation. Keep that in mind as you blend your lives together and depend on each other more.