About him testing to see if you you moved on...when I have broken up w/ boyfriends and they emailed me later to say hello, I emailed them back all pleasant but without intention of getting back together.
So being nice doesn't necessarily mean you haven't moved on. But decide what strategy you are using...if you are using NC for you, then you shouldn't reply to personal stuff.
If you are acting as if you don't care what he does and are just living your life, polite is fine.
me,34 exH,34 S,16 months S:3/31/09-left for OW started DBing 10/09 d final: sometime 10/10 current: http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2022856&page=1 met in 2004