Few months ago I met a girl who acted like your husband. Of course the situation was totally different since we weren't even dating but my attitude was the same as yours. I was uncomfortable with her attention (yeah, I know what you're thinking but what that girl was doing was literally shy of stalking). What worked for me was "tactical politeness".

Basically if she asked me "what are you up today?", I'd say something like "I'm very busy, how about you?". She says what she does and instead of engaging, I'd just make a comment "Sounds great!". She got bored and let it go. In your case it may play out in a different but as effective way. I think if you act as if you're fine and you don't engage, you may see the light at the end of tunnel. Narc cannot accept the situation when you're okay and he's not. Also ignoring hurts the NPD's ego the most, especially when there is no anger behind it. She ignores me and she's polite (doesn't care)? OMG, I'M LOSING! Kill him with kindness