Oddly Wired
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emotion

You forget the negative emotions of past events faster.

The emotional intensity associated with negative memories fades more rapidly than the intensity of positive memories.

A 2003 study confirmed that, over time, the sharp sting of failures and losses diminishes faster than the warmth of successes. This mechanism serves to protect your long-term psychological well-being.

Your history looks better in hindsight than it felt.

Where this comes from

Study
Walker et al., 2003
What the check found
The Walker, Skowronski, and Thompson (2003) study is the foundational paper for the 'fading affect bias,' which describes exactly this phenomenon. The claim is accurate to the core finding of that research.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.