For the longest time, my ex wife and I did not speak to each other... and if we did, communication was done thru our lawyers. But as the lawyer fees started to piled up, it seem we needed to find a way to be civil with each other.
I just don't know if there will be a day where we will see eye to eye, there's just too many things we differ on. I wouldn't consider my ex my friend, but at least we are on talking terms.
To me, there is a reason for break ups... being a friend meant there's till love between us. For us, whatever love that existed between us in the past, we both killed it.