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Remember: everything Slenderman - Creepypasta says is made up.

He took annoyance in you not taking the bait. You did not take the paper with a scribble about him, despite you either realizing about the danger of that, or discarding it as an internet prank. Now he's onto you.
What happens next will depend on what you do or not. But for now, watch your back. You can already feel an ominous supernatural feeling of being watched from afar, you just can't figure out where it is from.

NSFW

Slenderman - Creepypasta
The Slender Man is the paranormal figure that the Slender Man Mythos is centered around. Der Groรmann and the Wendigo are just a few examples of local explanations for this creature's existence, at least in lore.
Slender Man is an unusually tall entity, reportedly between six to nine feet, with a very thin build and limbs that cannot be attributed to a human in a suit. Witnesses have claimed rare instances of seeing its body proportions change, while tentacles or tendrils of varying length.
The behavior of the Slender Man is inconsistent, sometimes appearing malicious and aggressive towards people, stalking them until they develop "slendersickness." Particularly unsettling is the entity's apparent fixation on young children and young adults, with many children having gone missing during encounters with the creature. Tragically, some of these encounters have resulted in mutilated bodies being found. Additionally, the Slender Man is said to be able to ensnare people with its tentacles and violently thrash them around.