Is this weird?

My husband and I have been together for years, we’ve had the passwords to each others phones for years. He thought I got on his phone one night but I hadn’t so I told him that I hadn’t touched it but he started acting odd so I tried going on his phone since it’s usually not a problem and I found that he had changed his password. I asked why and he said he got mad that he thought I went on his phone so he changed his password. Mind you he went on my phone and I didn’t change my password after, it just feels so odd. I’m not going to touch his phone but I’m feeling very odd, insecure and unattractive now. I just don’t know what to think. Does it seem weird?

Edit: we also just had a baby a few weeks ago so it’s making it even tougher.