The problem with his claim is that nobody seems to believe him.
My own doubts about this story began when Paravania (one of his channel mods) confided in me that he admitted to her that it was all a scam and he had nothing to do with the original drawing.
One of my first stops was the popular website Know-Your-Meme who have a fairly extensive article on Forever Alone. Editors there tell me they thoroughly investigated his claims and found no merit in them--even asking a copyright attorney, who also found his claims had no merit.
According to Know-Your-Meme, the origin of Forever Alone:
"Forever Alone is considered one of the first major rage comic spin-off characters to be creater after the original Rage Guy, which first sprang up on 4chan in 2009. According to various sources, the original comic was uploaded in a thread titled “April Fools” byFunnyJunk user Azuul on May 28th, 2010"
My next step was to contact the merchandising department of Hot Topic since he claims they were paying him for Forever Alone merchandise. They never heard of him.
I also checked with two other wholesalers who carry Forever Alone merchandise and they also never heard of him.
A thorough discussion of the issue on Reddit ended with pretty much everyone telling ManlytearsUK to fuck off.
It looks like Britbong's entire claim to have created "Foreve Alone" can be traced to a UK website that allows you to copyright pretty much anything.
Other Sites Which Deny Britbong's Claim:
Forever Alone first appeared on Funny Junk in 2012, but Britbong didn't post it to his Deviant Art page until April 17, 2013, two months after he started making the claim on 4-chan.