(((Khenry))) - honestly? There's no telling what he wants, but my guess is that he doesn't like you pulling away; wants to tell you what he thinks you want to hear, just to keep stringing you along. He MAY legitimately want to know how you are doing, but even if he's been clean for these 2 weeks, that's not nearly enough time to have made the changes he needs to.
I know that's probably not what you want to hear, but I would keep my guard up. I think it would be better if you didn't answer the phone, as it will probably do a number on your emotions (it would me). Remember why you went NC in the first place. Let him feel the consequences of his actions. Remember the things he said LAST time you talked to him, and how much they hurt. Do you really want to go there again? Would you really trust anything he says? I know our hearts want to believe it if they say all the right stuff, but our gut usually has this icky feeling about it.
Hugs and prayers,
Amy