If a guy talks about his ex is he over her?
This is not nearly enough information to give you an accurate response. If you could be more specific about how he talks about her, how often, how long you've been dating, etc. then maybe we can help to answer.
Also please remember that the only person who knows for sure is him.
I think it is normal to talk about an X....The person was the last person to be in the persons life....all their RECENT experiences probably involved this person...as time goes on in a relationship...the X stories become less because they have already been told.
And quite frankly if it bothered me, I would ask the person if they were OVER their X.