Short answer: No, being an Aries doesn’t make someone a cheater. Zodiac signs describe tendencies, not moral choices. Aries can be impulsive and thrill-seeking, but cheating comes down to values, maturity, and communication—not a birthday. If you’re worried because your partner is an Aries, that’s understandable; seeking clarity and consistency is smart, and you deserve honesty regardless of anyone’s sun sign.

Many Aries value directness and loyalty, but they get restless if a relationship feels stagnant or unclear. Keep things grounded with explicit agreements about exclusivity, regular check-ins, and novelty that feeds their spark. Watch actions over words: reliability, responsiveness, and follow-through. If something feels off, name it early. If they show up consistently, let that build trust rather than horoscope fears.