I think the best thing you can do is listen and that's about it for now. Listen to your ex, but listen to yourself. If you are in a position where you want to consider reconciliation, then you can agree to set up a way to communicate with boundaries. Make the boundaries clear. Set ground rules. I'm looking at your sitch and this is a long time from your divorce. Do you want a relationship with this man at this point? You are likely to both be very different people at this point.
I think above all avoid the knee jerk reaction that might be very understandable, take a breath, and just consider your options paying close attention to what is best for YOU.
M45 Bomb 6/09; EA 6/10; Divorced 1/11 Proud single mom of 7 little feline girls and one little feline boy "Fall down 53 times. Get up 54." -- Zen saying