This friendship will bring exciting new influences to your lives. Your interactions will be spontaneous and will lead you places you won't expect to go. You'll be very social together and when you get together to hang out, you'll both like blending your groups of friends.
But while this aspect will keep things interesting, it's likely that interesting could fast become uncomfortable. You just won't be able to count on each other. Over time, your buddy will become more and more unreliable -- showing up late, canceling plans at the last minute, not being there for you when you need them and so on. None of this will foster any feelings of being close buddies. Although exciting, this friendship may end up being too unstable for you to maintain.