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But on this crisp morning it’s hard to focus on running. My thoughts are elsewhere. I think about fresh-faced Jonah Thompson and his annoying tenacity. I think about the article on Lisa’s death and its refusal to acknowledge how what she went through messed her up so much she decided to sink a knife into both her wrists. Mostly, though, I dwell on Lisa herself and what possibly could have been going through her mind when she sent me that email. Was she sad? Desperate? Was the knife already gripped in her trembling hands

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i tried but could not match the appropriate meaning. please help me

There is only one meaning in most of the dictionaries.

phrasal verb: dwell on / dwell upon


https://www.collinsdictionary.com/dictionary/english/dwell-on

https://en.wiktionary.org/wiki/dwell#English

Mostly, though, I dwell on Lisa herself and what possibly could have been going through her mind when she sent me that email.

He cannot stop thinking about Lisa. He wonders what she was thinking when she sent the email. He thinks about her attitude, what she was wearing, what she was doing.... etc. etc. etc.

He thinks about her for hours and hours and hours.

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