BTDT means been there done that. PMA means positive mental attitude.
It does sound like your H may be in MLC.
The best thing you can do is be pleasant, It sounds like you are trying to get him to do things with you. My advise is don't wait till he asks you. This way you do not seem pleading.
You need to act as if( you go do things and show him you do not need him in your life to be happy).
If he tries to argue just walk away. If he tells you about his issues just validate the things that are justified and leave the rest(like im'e sorry you feel that way). Do not let him rope you into an arguement.
The best thing you can do is work on you. You can't change H, only he can change the way he is thinking right now.
In MLC they will come up with all sorts of issues a lot of times. Things that were never mentioned or didn't seem to be a problem before.
Welcome to the Roller Coaster ride. No one likes it but, we are here, and we are here for each other. You will get great feedback here.
JAK
You don't get to choose how you're going to die. Or when, you can only decide how you're going to live now. ~Joan Baez