You are confused because you are afraid of making a mistake in your communication. We have all been there, especially after long periods of NC. Remember, NC is about getting your spouse out of a fog. You will not get your M back by staying NC forever.
You can reply something like "I'm great! Thanks for asking"
As for the library books, wth? A month late? Haha, make him pay the fine.
You can just reply 'Can you take the books back to the library? Not sure when I will have time this week'
Remember, he is asking the questions, not you. So it is not pursuing.
Thanks for this, Pilot. Yeah, I got what you meant. Here's what I ended up saying: "I'm great, thanks for asking! Glad you finished the books. I'm not sure when I'll have time this week to receive them. Could you possibly return them to the library? I think ___ would be the closest to you unless you're in ___ sometime."
I think I was friendly and positive enough. I feel a bit sad though because I do miss seeing him and this would have been a perfect reason to without me doing any pursuing. However, I understand that NC is what we both need for awhile. He has no reason to reach out now. What if he just never contacts me again? OK, I know that's totally silly of me to think that, because I still have a bunch of stuff at his place, but that's just where my mind goes.
Me: 35, H: 37, no kids Together since 2002, Married since 2007 IDKIILY: 2/2013 MC: 5/2013-6/2014 H stated he was REALLY done: 4/2014 I moved out 7/6/14 H filed end of 8/2014 but still hasn't served me