If you wanted someone to love you; wouldn’t you want them to love you of their own free will, rather than because they had no other choice?
Genesis 2:15-17, “And the LORD God took the man, and put him into the Garden of Eden to dress it and to keep it. And the LORD God commanded the man, saying, Of every tree of the garden thou mayest freely eat: But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely die.”
Satan used the serpent to deceive Eve. She chose to disobey God by eating of the fruit of the Tree of the Knowledge of Good and Evil. Adam, who was not deceived, also disobeyed God by eating of the fruit of the Tree of the Knowledge of Good and Evil.
Genesis 3:6, “And when the woman saw that the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise, she took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat.”
I Timothy 2:14, “Adam was not deceived, but the woman being deceived was in the transgression.”
This was how sin originated in mankind. The source of temptation was Satan, who is the personification of evil. Eve, then Adam, succumbed to the temptation and sinned. Human nature has been fallen ever since.