Guy from destiny?
I can't believe I missed that if it's anything like this.
It was this guy who kept following me around on Destiny for some reason and I didn't mind. Eventually they added me and I accepted because I only kept my friends list to irl friends. I left The Tower after doing some errands and was about to turn it off, and just when my finger was hovering over the off button, the guy joined my fireteam. Out of fear, I quickly turned it off and felt really bad...