i think is a "habit" in wanting to feel the "present" of our ex in our life...
sometime we tend to find out wat happen to him / her is because we want to know that... he / she not being good because of the separation... but when they are happy... we do feel like loser...
so i think... move on.. find another target... swift your attention will be good... to show off to ur ex that... u live BETTER than him /her...