I shouldn't be giving any relationship advice, but having been in the shoes similar to that guy I kind of feel an urge. So, from my point of view, as a possibly older version of that guy, I'd want you to actually become friends with him, and, paradoxically, also maybe block him on social media. I think it's way too easy to perceive a distorted, idealized image, when you don't have much experience of a possible reality, and actually stay with that. And the sooner that image is shattered, potentially the better for everyone.

However, this is just an idealized projection on my part, and might not actually apply or be impossible. Just food for thought, and maybe someone else will comment on this idea.