A misunderstanding?

So recently my very new boyfriend said on Sunday morning that he "needs alone time" for the rest of the day as he had to put his dog down at the vet the day before. I was there for him throughout the whole thing and even made him breakfast the next morning - basically just supported him through it all. I was really upset to hear that he wants to be by himself, I thought it was a pretty odd thing to say to your girlfriend, especially since we've just gotten together. Is this a red flag? I know everyone handles grief differently but I still think it's odd to be by yourself and not want your girlfriend around for any emotional support. It's also upsetting because we don't really get to see each other during the week and he wanted to spend Sunday alone. He's been really distant since I told him that made me upset. Any advice would be really appreciated! Thank you

A misunderstanding?
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