The fault IS in our stars—at least in part.

Four thousand years ago, the ancient Babylonians believed that the stars could predict or reflect character traits and human events. Though the science of astrology is now considered to be archaic, the twelve signs of the Zodiac are still eerily accurate at predicting human behavior. Perhaps not surprisingly, those who find solace in their astrological chart often apply it first and foremost to their love lives.

We’ve compiled a short guide to what each Zodiac sign means when they say, “I love you.”

Aries (March 21 – April 19)

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“I’m utterly infatuated with you.”

Aries put their lovers on a pedestal, and just like everything else in their lives, they commit passionately. They love strong, hard and fast: Every time you send them a text, their heart rate starts thumping like a marching band. When they say, “I love you,” they’re admitting you’re their moon, sun and stars — and everything in between.

Taurus (April 20 – May 20)

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“I trust you.”

People whose Zodiac sign is Taurus tend to be careful and deliberate by nature. They can be outwardly affectionate, but they’re very selective about who they trust. So for a Taurus to fall in love, they have to feel supremely comfortable with their partner. If a Taurus says “I love you,” what they’re really offering is their deep and abiding faith in you — and for you to feel the same way about them.

Gemini (May 21 – June 20)

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“I’m my truest self when I’m with you.”

A Gemini is, paradoxically, both a social and a very private person. While they may enjoy talking about what they ate for breakfast, their stylist’s recent breakup or what happened on last night’s episode of “Shameless,” their words tend to lack depth and emotional honesty. It can be difficult for a Gemini to truly open up, because they often don’t fully understand themselves. So when they say they love you, it’s a declaration that you’re the only person in the world they can be truly authentic around. And that’s no easy feat!

Cancer (June 21 – July 22)

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“Never leave me!”

Cancers are a passionate people and it can be overwhelming to be in a relationship with one. They tend to fall deeply, madly in love. They wait until they’re absolutely certain they’re safe, and then they cling like a leech like to a succulent piece of flesh. So when they say they love you, they’re telling you that you’re essential to their well-being, and that you leaving them would shatter their whole world.

Leo (July 23 – Aug. 22)

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“You win.”

Although Leos are loving by nature (and dispense that love freely), it can be difficult for them to settle down, since the grass everywhere looks so darn green. Though they tend to be charismatic and always seem to have plenty of people pursuing them, when they find someone to settle down with it’s a very deliberate decision. Therefore, winning a Leo’s love is one of the biggest compliments you could ever get.

Virgo (Aug. 23 – Sept. 22)

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“I could build a future with you.”

When a Virgo says “I love you,” they’re making a promise. Virgos are one of the most cautious and conservative signs in the whole Zodiac; they’re hyper-organized and they need balance in their lives to feel safe. When a Virgo declares their love, they’re definitely thinking about the long term — so make sure you’re ready for it.

Libra (Sept. 23 – Oct. 22)

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“I will always try to understand you.”

Libras can have a hard time relating to others. They’re intensely internal individuals and have difficulty empathizing since they can’t see past their own walls. But harmony and justice are paramount to a Libra, so they make a tremendous effort to be fair and to understand their partners. Without it, their own happiness would be impossible.

Scorpio (Oct. 23 – Nov. 21)

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“I will protect you at all costs.”

Scorpios tend to be stubborn, jealous and even manipulative people. But if you’re in their good graces, they’ll move heaven and earth to keep you safe. While Scorpios are typically not big on public displays of affection, they’re fiercely loyal to their loved ones. Therefore, a Scorpio dropping the “L” bomb is no trifling matter.

Sagittarius (Nov. 22 – Dec. 21)

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“I’m really into this — for now, anyways.”

Sagittarius is a freedom- and pleasure-loving sign. Your typical Centaur becomes bored or impatient quickly; they’re always longing for the open road. Certainly some of them are capable of lasting love, but generally they prefer to float from one sweetheart to the next. That doesn’t mean their proclamations of love aren’t genuine. It just means their devotion could be short-lived.

Capricorn (Dec. 22 – Jan. 19)

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“Let’s succeed together.”

Capricorns are incredibly ambitious, career-driven people. They’re superbly pragmatic, and are masters of business and politics and any other industry where careful maneuvering is rewarded. Although they sometimes struggle in their love lives — since a relationship means time spent away from achieving another life goal — they’re exceptionally adept at making the most favorable decision in any circumstance. So if you happen to be a part of that calculation, you can expect to be part of a very successful couple.

Aquarius (Jan. 20 – Feb. 18)

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“Come hell or high water, I will stay true to you.”

People whose sun is Aquarius are energetic and idealistic, but they often have a hard time with monogamy. Commitment freaks them out and the mere prospect of it can drive them further away from their partner when things start to get serious. But if an Aquarius has conquered those aversions and professes their love to you, they’ll be as constant as a rock in a stormy sea.

Pisces (Feb. 19 – March 20)

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“I will forgive you of anything.”

Pisces are incurable romantics. They’re dedicated and empathetic to a fault. They tend to forgive almost anything and therefore they sometimes find themselves in relationships with alcoholics, drug addicts or abusive partners as a result. So if a Pisces says “I love you” it means they’ll pardon you for almost any crime. The hard part is knowing when you perhaps shouldn’t have been pardoned.