Cognitive dissonance

[Flavius]

I suppose the brain is constantly bombarded with certain relics from past experiences that may trigger some of those conflicting thoughts. I personally get them when I am in a more depressing mood, which perhaps pushes someone to reiterate over their past decisions. What you stated is fairly similar to having gone through a break-up, you are sure the decision is beneficial to you, but you find yourself sometime in the future reassessing that decision.