jealousy.

benlaksana:

Jealousy is never truly a sign that you love someone, it is a sign that you see that other person that you “love” as an object of satisfaction of your expectations. It is merely a sign of attachment, of possession, that he or she is mine. And possession will eventually lead to misery.

Why am I saying this? Because it’s in the bible and any other holy book known to man. And because I too, like you, do not know on how to love otherwise.