This is hard to answer...I think you should look it up in DB/DR again, just to be sure.
One thing--
You have been supportive of him when he has had these breakdowns. Looking at it systematically, has it gotten you any closer to your goals? Has it changed the way he treats you at other times? Does it bring him any closer? Or does he pull away more? I can't recall, but I am sure you know...
If things stay the same, you may want to stick with it for a while and see if change eventually happens, one way or another. If they worsen, do a 180 and change your response--if you were nurturing, stop. See if he starts to pout around you even more, or changes tactics (hopefully to a more positive one around you...?)
I know kids that seek attention, ANY attention, even negative attention. If he changes tactics on you (from pouting to anger toward you, etc.), he may be seeking more attention from you... but I wouldn't give it to him when he is being negative--that reinforces that behavior. Try to give more attention when he is acting like you would hope to see--normal, or cordial, or friendly, etc.
Anyway, that is child-behavior management from an elem teacher standpoint--not sure if you can apply any of that to your H. At least another viewpoint to think about.
