EH, The first question that pops into my mind is this...do you want him back?
If he's begun waking up a bit and reconnecting, then it's possible that he is finally realizing what he's lost. Reconnection takes a long time.
I know you are afraid of being burned again, but if you keep your expectations at zero, you will not be disappointed. Don't consider him your xh, but someone you are meeting for the very first time in eons. If I were in your shoes, I'd accept his offer the next time. You won't know what is on his mind until you sit down and meet w/him. He can't do a thing to you unless you allow him to. I would suggest that you drive to the meeting so that if you get disgusted or feel the conversation isn't going the way you think it should, you can get up and leave.
In some cases of reconnection, the ow is still in the picture and will eventually be kicked to the curb as the mlcers reconnections become stronger. Your children should be old enough to make decisions as to whether they want the ow present or not during their time w/their father.
One final note...just be yourself. Listen to what he has to say. You just might hear more about his life and discover that his life isn't what it has appeared to be after all of this time.
Good luck!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
