For the past five or so years, I've had problems sticking to a single game. Whenever I get a new one and find that I like it, I have a tendency to become addicted and play it and only it for hours on end. Unfortunately, this then leads to me becoming tired of the game, not getting around to finishing it, and basically tossing it aside. I have the same problem with music as well, which is arguably worse, where I find a good song, listen to it for hours straight (while doing other stuff of course), and promptly get tired of it.
However, this doesn't seem to apply to multiplayer games as much (Gmod, CSS, etc) or games that basically require you grind levels into your brain to succeed at (Audiosurf especially, which I picked up something like a year ago and still play somewhat actively to this day, the Touhou series to a lesser degree in that I usually get back to it at some point). But it does apply to multiplayer games featuring long term projects; for example, when I get involved in B12 activities in other games, I typically am on almost always in the beginning, and slowly drift out as time passes. This is an incredibly irritating thing, and I'd prefer if I could find a way not to lose interest so fast. Any advice?