He's still a confused mess and, of course, the holidays were upon us and he felt miserable for being where he's at right now, i.e., not home w/his family. His ramblings of blame, etc., were to let you know he's still out there and yes, he wanted you to remember him. It's not the best way to go about it, but as a teenager who is still "smarting" from not getting everything that he thinks he deserves, it's the only way he can communicate and get your attention.
As for his latest missive wishing you and the boys peace and happiness...I'm glad he did it and I really liked your response.
You will see your h going up and down on the coaster for a while because he's still an emotional mess. He doesn't know which way to turn and he'll continue to lash out for a while. The best thing to do is ignore the bad behavior and if he does act like a civil human being...then recognize that behavior and be kind. They honestly do not care if they get positive or negative attention, just like little ones.
I do hope that the new year will be a much better year for you and your sons.
Happy New Year!
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.