DP is very sensitive about the state of the house as due to long-term depression we have major unfinished projects (mainly the kitchen) - think still-boxed kitchen units in the living-room for a decade. Just for context.
We also have several minor modifications to the house he's made himself, so the whole house will need to be certified by an electrician if we ever want to sell. I'm trying not to think about it.
The other day he was talking about how dark it is in the living room and suggesting running some more lights off the central ones. I said it would be a lot of work and maybe we could try a standard lamp first. He seemed to agree eventually.
Yesterday he bought a shelf and today he was doing some drilling on the workbench in the kitchen. It turns out he's making a mount for more ceiling lights and asks me how I would like them oriented. I said I didn't know and I thought we were getting a standard lamp, but I wasn't quite sure what to say. He seemed very upset. I also said that I didn't want to have this conversation again. I'd thought we'd agreed not go down this route.
I came back in the living room to find him immobile with a grumpy fixed expression. He wouldn't respond with more than a word or two to anything but denied being upset. Then after a while he suddenly jumped up, went into the kitchen, came back, and just kind of stirred around all the stuff on the table angrily looking for something rather than lifting the mess to look under it. I asked him to be careful and he told me it's all just a fucking mess anyway.
He seems really upset and while I'm annoyed he's gone ahead with a project that I thought we'd agreed not to, I'm not sure what to do now as he knows I don't really want him to start this project and have another DIY modification. But it's his house.
Maintenance and tidiness are such flashpoints and I find we can't even have discussions about whether to get someone in or do some task without him taking it as a criticism of him and I'm finding it a big strain. We both suffer from mental health problems and spend pretty much all our time together, and I'm currently quite acutely unwell.
He seems so depressed but won't admit when he's feeling low and I don't know what to do.