Jealousy starts from a small event. When you feel that someone is better than you. someone is closer to your object of devotion than you. After it started, you will look at anything as suspicious. Anything will add oil to the fire of Jealousy. Any attempts of Logic and Common Sense to get through would fail(gray figures). The only logic you use is to justify and to rationalize your actions.Those actions will build a wall that will bury away from your devotion.