Why does he do this?

I've been spending time with this guy for 7 months. For some reason, when we are walking out together and a car pulls out the drive, he will put his arm across me

Another time a car was speeding towards us and we both dodged the car but he put his arm out in front of me at the same time

This happens almost every time we hang out together.

Why does he behave like this?
Why does he do this?
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