Cupid was the son of Venus, the goddess of love and beauty. There are myths about Cupid and his arrows. Cupid's arrows could make you fall in love. In fact, when Cupid shot his arrows into an unsuspecting victim, that victim (mortal or god) fell in love with the very next person they saw!
His arrows did not work on himself. He had tried many times to fall in love, but he could not, until one day, something amazing happened! The myth of Eros and Psyche was adopted by Romans from the Greeks. The Romans renamed the Greek god Eros, to the Roman god Cupid, but the myth remained the same.