Many years ago I had a very close relationship (not romantic) with a female friend which went pear-shaped when a new woman started at the place where we worked.
The first idea I had about the relationship declining was just a feeling that my friend was pulling away, or being different with me at certain times, but her old self at others. My friend later told me that the new woman had been keen to go out to lunch with her, without me, and had told my friend not to tell me.
My friend had maintained the secrecy for a few weeks, before telling me about their lunch 'dates' because she felt guilty and it was getting to the stage where she'd have to lie to me about her whereabouts, and she felt the secrecy was just getting silly anyway as we were grown women.
The point of describing this experience from years ago is that I now have unfortunately been experiencing exactly the same feeling about my DH - that he's pulling away from me from time to time, sometimes being completely normal, and at other times, being different. There doesn't appear to be a pattern to it. It can catch me unawares.
When I think back to how my friend was. She was not horrible to me at all during that time, we'd still get on really well, but sometimes she would be tight-lipped when we chatted. Less free-flowing. Occasionally she would just almost stare blankly back at me when I'd say something. She was basically just different from time to time, I suppose, not her normal self. When I think about the vibes I got back then, I am reminded of them now with DH.
My first thought is that he's being persuaded in a similar way. But about what or by whom I don't know. The experiences are some 30 years apart so it's not like I always have this feeling either.
What would you do? Wait and see if he says something, like my friend did?
I did ask him the other day what was up as he was looking pretty fed up. He immediately looked up and changed his facial expression to look happier and said he just had a headache. I've also asked him if he's depressed and he says no more than anyone else throughout this pandemic.