Quote by @Linda:
"Fake relationships are alive because many don't understand unconditional love."
In nature, unconditional love only exists between parents and their children. The love between adults always is conditional, because the condition for true love is to not hurt your partner (and others).
This means: In order to be able to learn how true love works, children need unconditional love in their childhood.
This is called "love indoctrination", as explained in this video: