It took me forever to understand it but eventually I think I have. Now I don't know what this will mean for you since dreams and symbolism are always personal and relative to the dreamer but I will share it anyway. Dreams, as most of know, are never really about other people but about our SELF just heavy laden with symbolism. In this case, the ex husband simply symbolizes those things about myself that I loved and have cut off out of my life when I left him and wanted nothing to do with him. They are the good qualities about my SELF that I needed to accept, love and let prosper in my life. They are the things I loved about him so they are worthy of loving within myself too. For me, I know that the dreams have little to do with what the previous answer is (unconsciously wanting to be back together---so not true) but has to do with how I feel about myself. Yes, I left my ex husband with good reason. Sadly things didn't work out but such is life but in that process of leaving him, I ended up leaving good things about my Self behind too that I needed in my life. The only reconciliation taking place was the one within mySelf.
I hope that helps you.