Yikes. Just the fact that you haven't spoken in a year and now you are texting, is probably a good indicator that you are not approaching the divorce nor the possibility of reconcilation very seriously.
A few friendly txt msgs doesn't really mean a whole lot. You can text your mechanic, but it doesn't mean you want to be with him.
Marriages, divorces, all of that is hopefully based on mutual agreement. Something happened to get you to the point of saying the word divorce. Is that something no longer an issue, because if it is, then nothing has changed.
You can't put on your red cape and save a marriage all by yourself. People confuse divorces with levels of emotions, just because you are getting a divorce doesn't mean you turn off the emotional switches, that sort of thing comes with time.
You have to think also, why haven't you spoken by phone, maybe he is already involved with someone and has to send you text messages. And who initiated the "re-connect", was it you? What were your motivations? You not wanting to lose him is not a good enough reason to get caught up in a fantasy, you have to determine what is real, and what is best for you. Best wishes.