Negativity Bias is the tendency to focus more on negative things rather than positive things. Assuming two interactions of equal weight, one positive and one negative, we tend to treat the negative interaction as more significant and will dwell on it.
From an evolutionary standpoint, this was a key biological trait that allowed humans to survive and avoid predators. In modern times, this tends to have less use and can even negatively impact interactions with others, such as during dating.
It may be our natural tendency to lean into the negativity bias, but it can be worked against. An effective approach is to practice gratitude; while journaling, write down one thing each day you are grateful for (this is frustratingly effective).
- Negativity bias, Wikipedia