Why does your girlfriend talk about her ex boyfriend a lot does she still love him?

It may be because somethings that you are doing reminds him of her. And it could also be that he has recently been interacting with her. It may be an indication of some attraction towards his ex, but it does not mean that he wants to be with her. For example, I had been dating this girl for 2 years but we broke up about a year ago. In my current relationship, we have been dating for a year and now and i did not start talking about my ex until she started doing things that reminded me of my ex. It was just smalls things that she did. It did not make it acceptable but i did start to mention my ex a lot because of my current girlfriends actions. What you should do is ask him yourself, why he abruptly started talking about his ex, when he hadn't before? If him discussing his ex girlfriend makes you uncomfortable you should share it with him. He might not know that it makes you uncomfortable. But he could also be talking with her again, but that is not always the case. So the best advice is to ask him why he does it.