OP, I think yes, you do have a LOT to think about. I know it can be really overwhelming. One thing I would say is while we use phrases like, "sulking is designed to make you feel guilty" don't get too hung up on this concept of him doing it deliberately. I think many people who behave this way are not sitting there thinking, "right, if I sulk now, then x will happen". It would be easier if they did because then we could just see that these are not good people.
Rather, they are unconsciously employing tactics that will get the outcome they want - less "stress", more time with their partner, complete control over what happens at home etc etc. Unfortunately, the chances are they will never see it, which, of course, is a core part of the problem - they cannot and will not reflect on their own behaviour.
as he said then that I was turning things into a big deal - my argument would be that him not picking up his socks and underpants, ever, even though he has been asked to please do so, is what has turned this into a big deal....
That not going to plan can be something his family have done, the cat has done etc. (not just me) – and I think that’s why I’ve seen it as a general stress issue rather than just a relationship issue so far. but th point is that he wants YOU to take it on (or, I suspect, his family). So if the cat's vet management is too stressful... ta da, you take it on and suddenly he doesn't have to worry about it?
There’s other times that I’m now thinking of too, like when we took the same week off work and then he was disappointed because I ended up spending some days on my own. He said if I’d told him in advance he could have gone to work and saved his time off. This one is clever because it's tricky. He's suggesting that if he'd KNOWN you were doing other things, he wouldn't have taken all the time off. So it becomes YOUR fault and you agree. But let me turn it around for as second - DH and I could go on holiday to another country for a week and I can promise you, neither of us would ever assume that we're spending 100% of our time together. I mean, sure, if its a staycation then perhaps some chit chat about the fact that you want to meet your Mum for shopping and lunch and are planning to finally get stuck into that big art project would be good, but think about this for a second - is it really realistic to expect to spend all day, every day together? Would you even want that?
On the times I have been out though then yes he has always come to collect me. I can see why there could be some control there… as it does mean I have to communicate a pick-up time with him. I just thought he was being kind as he was at home doing nothing and seemed silly for me to pay for a taxi. I totally understand that and in theory, of course that's true - pre kids, DH would always be willing to pick me up if I needed it.
But at some point, it might well impact other aspects of your decision making whether that's where to go, what to drink, what time to leave etc. If it's not, that's great, but it's definitely a consideration. And what happens if you say no? There was a woman on here years ago who found that over time, the result of this "kindness" was that she wasn't allowed to go out with work mates or in the city because that was too difficult/late for him to collect her. It all came to a head one day when she told him she was going on a big work nights out and was going to stay over at a colleague/friend's house in town.... he had a complete meltdown and she suddenly realised that her life had shrunk hugely over the previous however many years.
I'm really sorry to keep flagging all this. It's just that these are all pretty common early signs and it's also completely normal not to see them. I recently found a thread on here about SIL and her (now) ex that I started 10 years ago. What struck me was how many red flags I mentioned without even realising they were flags and, when I look back now, there were so many things I didn't even add in my original post because I genuinely had no idea that they were things I should be concerned about.