Aversion to happiness
Aversion to happiness, also called fear of happiness, is an attitude towards happiness in which individuals may deliberately avoid experiences that invoke positive emotions or happiness. Aversion to happiness is not a recognized mental health disorder on its own, but it can contribute to and/or exacerbate existing mental health issues. Mohsen Joshanloo and Dan Weijers identify four reasons for an aversion to happiness:

a belief that happiness will cause bad things to happen
that happiness will cause you to become a bad person
that expressing happiness is somehow bad for you and others
that pursuing happiness is bad for you and others.For example, "some people—in Western and Eastern cultures—are wary of happiness because they believe that bad things, such as unhappiness, suffering, and death, tend to happen to happy people." Empirical studies show that fear of happiness is associated with fragility of happiness beliefs, suggesting that one of the causes of aversion to happiness may be the belief that happiness is unstable and fragile. Research shows that fear of happiness is associated with avoidant and anxious attachment styles.