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Sentimentalize
Exaggerated Emotions
Use 'sentimentalize' when someone shows stronger feelings than the situation warrants, often through nostalgia. 
Nuanced Perception
Remember 'sentimentalize' can imply a lack of realism or objectivity due to strong emotions. 
Not Always Positive
'Sentimentalize' isn't always positive; it can suggest an overemphasis on emotion that skews perception. 