I agree with what Jgnat said :-)
Just thinking on the human side for a moment, I would still be a little guarded. I know that you are DF'd so from that point of view there is not much else they can do to you, but on a one to one level there is nothing quite as hurtful as opening up to someone and then them turning it back on you when they have a change of heart.
Whenever I let a JW or ex-JW into my life I make it quite clear that I don't play by WT rules. So if I allow them back I expected them to show mutual respect. JWs think they are the master race and can treat people in a despicable manner if it suits them or if they have a change of heart. I make it clear in a firm but open way, that if that happens then I will terminate the 'friendship' and it will be for good. I look at this as protection for myself and my family. In short, I do not trust them but I am willing to give them a chance. But only once.
My advice would be to be cautious. That said, I hope a friend comes back into your life. It has happened to me several times. :-)