You've probably noticed that some friends come into your life, hang out for a while, and then go on their merry way. Then there are people you just know will beyour friends for life. And one of the many reasons for that may be the way in which your zodiac signs combine.
"We unknowingly gravitate towards people with a similar frequency, vibe, [and] approach to life," Julie McGill, an astrologer who specializes in relationships, tells Bustle. And since there are many specific characteristics associated with each sign, you might be drawn to folks whose traits mesh well with and/or complement your own.
Other astrological factors can also be at play. For example, many "friendship patterns follow the rule that place air and fire signs in one category [...] and water and earth signs in another," McGill says. You might find that forming friendships with air signs when you're a water sign never feels quite right. You have nice conversations, and think they're great, but it never becomes a friendship of the let's-grow-old-together variety.
Of course, even the best friendships can wax and wane, and will need to be maintained just like any other relationship. But for the duos listed below, the strong astrological connection might make it easier to overcome these obstacles — while also giving you lots of things in common — so you can remain friends forever.