Why is air signs's love the longest?

Air signs: air signs includes Gemini, Libra and Aquarius. The air constellation is actually very extreme in the long-term love index, either promiscuous, falling in love at first sight, and then forgetting; Or infatuation, a glimpse, and then the rest of my life. So, on the whole, air signs has never met anyone who really wants to love. Therefore, air signs can fall in love with different people to varying degrees, but it is not profound. Sometimes he thinks, but when he is happy, he forgets the person he likes. But once air signs has identified a person, he will also be very devoted.