What does it mean when a girl is having a hard time moving on from a guy she went on one date with a year ago?

Why would she be struggling so much with it? Still emotional… still wishing he would talk to her after he disrespected her and primarily only wanted sex… she’s still very upset because she feels deceived and played by him after he made her feel safe
What does it mean when a girl is having a hard time moving on from a guy she went on one date with a year ago?
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