You'll notice a real conflict between you of optimism versus realism; of expansion versus restriction; of adventuresome spirit versus practicality. You'll both feel a strong need for caution as well as an equally strong need to break away from that type of limitation, and this conflict could lead to instability in the relationship. One minute you'll feel fine about things -- you're working together, you're proceeding slowly but surely toward goals you both care about; the next minute you'll feel incredibly limited by your bond -- you'll want more adventure, less pessimism and restriction!
One of you could take on the role of stick-in-the-mud while the other is cast as the heedless, impulsive dreamer, or you could trade off positions; but either way, you'll both feel frustrated with each other, and your relationship will suffer from the lack of balance. Your patience with each other will be short, which will only make things worse when you start arguing about how to approach things. Developing greater tolerance will be key here; so will learning to give each other plenty of freedom. You'll both need to try to work together to create openness and buoyancy between you, while staying practical and grounded as a couple.