I have made progress during the two months he has been 3000 miles away. It was hard earned. I remember clearly the abuse and loss of my identity. I will not give that up. But, the sick thing is that I can see myself slipping into too much contact and being unclear in my messages. By unclear, I mean saying something half-heartedly useful just to avoid confronting myself and the difficult message I need to deliver.
The good thing is that you recognize that you are in an emotional "danger zone" by resuming contact with him. You also recognize your temptation to "say something half-hearted" in order to avoid any type of discomfort.
Those are two big "pluses"!

The problem is that you are loathe to do what you already know you need to do to keep yourself safe.
He is planning to move back here for a few months. He wants his car ownership paperwork and special can opener. The only things of his I have. I said I'd leave them at our mutual friend's house. Then he implied he could get them from me. I feel him creeping closer and I don't like it.
GOOD FOR YOU! I wouldn't like it either. He is pushing your boundaries, potentially trying to manipulate you, and it's good that you see it. If I were you I would drop those items off at your mutual friend's house SOON so this becomes a non-issue.
You drew a boundary line (because you very clearly implied that you aren't interested in meeting up with him) and he is trying to get you to withdraw that boundary. Stand your ground.
I am confused about what I want to say, before I go NC. Though I don't have to say anything or answer any more emails. I could just leave it as is. However, I have a nagging feeling that I should let him know if I don't want to see him. Maybe he wouldn't come here then. But it's not my job. He isn't consulting me on his decision to come here.
You're confused because your heart is interfering, I understand.
You're also confused about what to say... .how about what you have actually communicated in your post?
"After thinking about it further, I will not be able to help you with your apartment search. I have left the items I had of yours with our mutual friend. I wish you the best but no longer wish to remain in contact." Then resume NC.
Here's the thing you DON'T want to do: enter into long conversations (either of your own volition or in response to his questions) about why you made this decision - don't JADE (justify, argue, defend or explain). As an adult, you are entitled to make decisions that are in your own best interest - PERIOD. You are no longer in a r/s with him; you don't owe him any explanations.
It's strange because he came to this small town because I was here. And was here 5 years mainly because of me. Now, he is returning but for what reason? He doesn't like this town and doesn't plan to stay.
GOOD! Your spiderman spidey-sense is tingling!

You are questioning why in the world he's coming back - and I would if I were you too. Seems odd; seems like he is attempting to wiggle his way back into your life (email contact; help with apartment hunting; meet up so he can get his stuff).
I think your gut is leading you in exactly the right direction. You know he's up to something; you know it wouldn't be healthy for you to resume contact. The only thing that remains to be seen is if you do the "hard thing" of delivering the message that draws a boundary that keeps you safe and sane.
Each of these emails is a step closer to seeing him. It's not healthy for me.
Indeed. I'm rooting for you!