Lotza Fish In The Sea, You Don't Need Me

There are approximately 6.8 billion people in the world. 

If you square that number and divide by two you get 23,120,000,000,000,000,000 - which is the number of possible human relationships - friends, acquaintance; lovers - possible. 

And that's not even including man's best friend, The Dog. 

This is why stalking one particular human doesn't make much sense.