They, like others, will lash out at the ones that they love because they know that we can take it. Mlcers are truly scared kids who are learning how to grow up. In the case of your dog, now that you've mentioned the passing of another one...yes, he is scared and concerned about the well being of the dog and the only way, in his mind, that he can get his concern across was to copy the lawyers on the note.
They can harbor anger for a very long time until it is spent. Just imagine how much time and energy it takes to remain angry at someone and not really know the reason that they are angry. Continue as you have been. Your h needs compassion, prayers and patience. He's a lost boy in the woods trying to find his way out w/o too much pain in the process.
Hang in there! I think you've been doing great!
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.