I entered into relationship with girl who hasn't moved on from her past relationship, and she sometimes tell me that she misses him, what should I do?

They were in 10 year relationship and broke off. After a month we entered into relationship but she isn't able to open up emotionally yet and says sometimes that she misses him. What should i do i am completely confused. She respects me and she sees me as potential partner but is struggling moving on from past.

I entered into relationship with girl who hasn't moved on from her past relationship, and she sometimes tell me that she misses him, what should I do?
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