Passionate love fades mainly because people push it away. Their actions usually depend on insecurities, obsession, jealousy, indifference, and lack of enthusiasm. The main factors are… 1. Childhood learned behaviors If your parents neglected you, you possibly learned to fend for yourself while you clung to them. If they were intrusive, you avoided them since childhood. If they were too strict, you possibly made a fuss until they gave in. Children always find out ways to cope with their parents. However, it becomes a habit and impacts their adult relationships. They pair with people similar to their parents. In the long run, they get hurt and the passion fades. 2. Attachment issues People with anxious or avoidant attachment styles face trouble finding a partner. They might choose someone who reassures them continuously or is emotionally unavailable, respectively. In the long run, they find out that their partners only complement their attachment style but there’s no compatibility. 3. Fantasy Some people fall in love with others' superficial qualities like appearances. Such relationships have no emotions, feelings, or intimacy. So, they also fall out of love soon. Sometimes, couples fall in love with the idea of “being in love”. They obsess over relationships rather than one another. When they get bored of the idea, the passion fades.