I'm looking for a word that could describe a character's personality in the sense that he is someone who (re)lives the past too much and is uncapable of overcoming it and moving on with his life.
I appreciate it.
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Concerned with the past rather than the present and future FOD
live in the past: Fig. to live while dwelling on past memories without participating in the present or planning for the future. You are just living in the past. Join us in the twenty-first century. McGraw-Hill Dictionary of American Idioms and Phrasal Verbs
ridden: adj. dominated, harassed, or obsessed by. Often used in combination: disease-ridden; grief-ridden. American Heritage® Dictionary
Someone who has old-fashioned ideas or who does not like trying new or exciting things. M-W