I told you last year, I thought Gary had repressed homosexuality tendencies, and this proves it. Grabbing a picture avatar of another dude and putting it in his library.
I could also make the assumption that is why he is so obsessed with Paul and Mark and constantly talking about them, even when they ignore him for weeks on end.
And my final assumption is that with @Paul now sitting in Gary's shitbox and talking to him daily, Gary is fapping away like a maniac during that time, bringing his latent homosexuality feelings to the surface and with no one around, he doesn't have to worry about being caught.
Then what happens? A day or two later, Gary realizes he let his homosexuality bubble to the surface, a rage ensues, things get wiped, and he acts like it never happened. Rinse and repeat.
I think I finally figured Gary out!