Friend ignoring me on facebook?

[Da Man]

Alright I have this one friend on Facebook who I was friends with in high school and the early part of college however we haven't hung out in a while ( for like several months) so I message him twice asking if he wants to hang out sometime but he didn't reply back, and whenever I comment on his statuses he doesn't acknowledge my posts unlike what he does with other friends. Like what the heck? It sucks since I have social anxiety so my social circle is already small as it is, there are only a few people who I'm comfortable hanging out with.

Do you guys think I'm looking to much into or is it a reasonable think to worry about?