ressasser

to dwell on, to keep thinking about

ʁ ə . s a . s e
verb Rare #51,962
to dwell on, to keep thinking about Often suggests repeatedly thinking about something unpleasant or worrying.
FR: Il faut arrêter de ressasser cette dispute.
EN: You have to stop dwelling on that argument.

J'étais dans ma chambre, en train de ressasser l'opportunité manquée.

I was in my room, brooding over the missed opportunity.

Si je ne l'avais pas retrouvé, j'aurais passé la journée à ressasser.

If I hadn’t found it again, I would have spent the day dwelling on it.

— Aquarius (2016)

Ressasser ne sert à rien.

Dwelling on it is pointless.

— Qui suis-je (2014)

Je pense que tu as tort de ressasser ces rêves.

I think you're wrong to keep dwelling on these dreams.

— Harry Potter et la Coupe de feu (2005)

Sounds similar to