To dwell on the past informal verb phrase
Used to say that someone thinks too much about a past event or events to the point where it adversely affects the present or their ability to plan for the future.
Life moved too fast, so you shouldn't dwell on the past.
Don't dwell on the past. Why don't we resume our former friendship?
to say or reply something without having thought about it or knowing whether it is corect
To think carefully and seriously or ponder about someone or something
To help or convince someone to begin thinking reasonably (about something).
To think about an issue or possibility thoroughly and without haste.
The verb "dwell" should be conjugated according to its tense.