Thanks for the quick reply MickeyCheeky❤.

When we talked about it he explained how this "grumpy and inward" behaviour is his way of expressing a need for space. But I don't quite understand why he sometimes in these moments of his says "I feel weird" or "I don't know what's wrong". Maybe I should ask him specifically about this...

When he requests space, I'm thinking he wants to be alone in our shared home. I've offered to study and write elsewhere, be more away from home etc. But then he says "you shouldn't have to". My suggestions are completely sincere, If I can help him by giving more space I'll be glad to.