You might not be heading down the exact same path in life -- you most likely have different career or educational goals -- but you still understand each other's goals very well, and you're able to support each other in a really important way. This commonality could be based on similar past experiences, or it could just come from a feeling of familiarity and unity that exists naturally between you. But whether you've had similar pasts or not, you are able to offer each other solid advice based on your own experiences.
Other aspects between you might support a serious commitment or a long-term bond, and if so, this one underscores that influence. Either way, you play an important role in each other's lives, even if this is only a short-term affair. Even if you're quite different in your interests and your aims, there's a common thread that runs between you, and that keeps you united, running along parallel tracks. Talking openly about your goals, your dreams and also your anxieties also helps keep you both on track, because you're able to help each other get over any hidden fears -- of either failure or success -- and push through them. Don't let yourselves or each other lose that motivation; keep moving forward together, and you both find great results.