i'd feel annoyed and tell her to stop talking about him.
i read a story on reddit like this recently. the dude was upset that his current wife of 2 years constantly talks about how good looking and attractive her ex was. apparently he was abusive as shit so she left him, but still loved him.
anyway things got to a breaking point where she got drunk and started lamenting how beautiful his uh, feet were? something. dude asked for advice
and you know what they did? they talked about it and worked it out and she agreed to keep that to herself and to move forward with their marriage.
Well that's good. But I can't forget what I've heard.