hi morgan, I think 'normal' conversation is good, its a way of connecting, a way of reminding him that he loved that part about you. I know the OW's H told me when my H would talk to her about mundane things (from the recorded calls), that OW would easily lose interest and try to sway the talk back to sex/secrets/sneaking around. BARF O RAMA
So, if your H's OW does this, I am sure that's missing from his life. Its not that he is using you to fill that void, but I bet he is remembering that, yeah, that was nice.