Alan,
You need to start REDIRECTING and INTERRUPTING these thoughts she's having about her ex. The only reason why she's still thinking of him, is because there is NO BETTER replacement yet - which I hope, is your job to fulfill this role of the NEXT BEST THING in his life.
Live the moment, talk about more deep and personal matters, round up a series of hot active action dates that are kino-friendly (pool, swimming etc.)
You need to gradually HELP HER remove memories of her ex from her mind.
Hope that helps bro

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