If someone talks about their ex with a new dating prospect, chances are good that they aren’t completely over the past relationship. Unless you plan on bringing your ex with you into your new relationships, there ’s no reason to discuss them. If a relationship is committed and kids are involved, a discussion some of the past will prepare a new partner for what’s what when dealing with past love interests. 

What she wants: For him to be interested in finding out more about her, without him needing to compare everything happening to his past.