Laurie is so correct, as I went through a little MLC myself. I did not have an A though, I knew where to draw the line.
A few things laurie said hit me that it is what my H must be feeling and brought new understanding to his MLC. Sometimes the best 2 things you can do is give them space and be there if they need a friend.
Try to work on the bitterness you have. Afterall, MLC is like a sickness. And as Laurie said there are many people inside of them. We know alot about our S's, their secrets, I agree they just want to be around people that don't know them that well!