One day, you were walking normally on the road with your friend. Suddenly a notification came to your phone and you let go of your friend's arm.

You started looking at the message, and while you were doing this, you were walking. Then you took your "friend's" arm again, while you started talking. You talked for a minute, but for some reason you didn't get an answer and you looked next to you.

You saw that he was actually someone you didn't know and wasn't your friend...Your arm was still wrapped around his arm.