Sis, When spending time w/your h this weekend, treat him as you would a friend, nothing more. Remain calm and collected, smile often and hold your head up high. Try to relax and enjoy the festivities as best you can. Keep your expectations at zero or close to zero.
They always tend to get a little bit close and then recoil. They don't want to feel and/or think about what they had because right now, they think we are cause of all of their unhappiness. He'll flutter closer to the candle (you) just like a moth and then flutter away again. In some ways, he's checking to see if you are right where he left you.
BTW, they do tend to get curious and will ask others about you, this is very normal behavior.
One more thing...get a nice dress and be the hottest woman there besides the bride.
Stay the course and keep the focus on you.
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.
