Rumination

Tendency to repeatedly and passively rehash on one’s emotional state, cause and implications; closely linked to depression maintenance and prediction. See also chatter. Contrast with suppression.

Reference:

Pasyugina, I., Koval, P., De Leersnyder, D., Mesquita, B. & Kuppens, P. (2015). Distinguishing between level and impact of rumination as predictors of depressive symptoms: an experience sampling study. Cognition & Emotion, 29(4): 736.746. https://doi.org/10.1080/02699931.2014.932755