Skip the drama, the playing victim, the manipulation. Again, be adult. Think about you, what you can do to fix the problem. Yes, do your best to let the other person know what you need and what (s)he can concretely do to make things better, but then get to work. Buckle down and do what you can to make the situation and problem better without keeping score, tallying up martyr points, without any expectations of the other. Again, since the focus is on changing patterns, if you do your part the best you can, things will begin to change.
Another frequent error is wanting to talk constantly about the past in your messages. You have to stop focusing on your nostalgia and on what you’ve experienced together. You ex needs something else. It’s of course tempting to send a little message saying, “I miss you,” “I love you,” or “My feelings for you are still strong.” Truth be told, during this stage these types of things can damage your odds of success so refrain from sending them.