Toffee71 - I haven't read the whole thread just 1st page where you were getting great advice and it seemed like the scales were falling from your eyes...........but now you are looking for insights into his passive/aggresive behaviour. I think people use P/A behaviour in the wrong place. My guess is that he has "learned" this behaviour from one or both of his parents (we all do this to a greater or lesser extent) and copy it,mostly in an unconscious manner. I know every one is telling you to ignore it and yes I agree, but you're not ready to call time on this r/ship. What do you propose to do when you've looked into P/A behaviour -(which I don't think is the problem) Anyway what do you propose to do when you've found some insight into P/A behaviour? You can't have a conversation with him about his behavior - can you? If not why not? Are you a little afraid of him I wonder. Sulking is his way of coping when things don't go his way and it is very controlling - much worse than having a row and a shout if necessary.
I fear you will stay in this r/ship and things will get worse, but that of course is your choice. Please don't think you can change him because you can't - what do you know of his r/sip history - have you talked about that. I imagine there have been divorces and separations in the past, and interesting how he describes the separations etc - if he's prepared to do so. Are you able to discuss anything together that is uncomfortable for both of you. Ask him about his childhood, what sort of parents did he have, siblings - try to get a picture of his early years - that will give you more answers than looking for insights into P/A behaviour.