I'm the same as you. Some of the games I own, but haven't even started:
Psychonauts
Company of Heroes
Silent Hill 3
Galactic Civilizations
Civilization 4
Splinter Cell Trilogy
I also got an hour or so into Kingdom Hearts and Ratchet & Clank before going back to Europa Universalis and Team Fortress 2, not to mention I still haven't finished Super Paper Mario, Zack&Wiki or UR MR GAY.
Those are all excellent games I'm glad to have on my shelves, but it'll be a while before I can give them them the attention they deserve.
The old relationship is still giving more than a new one could, but there will come a time when boredom sets in, and a passionate new relationship with another game will feel a lot better.
... damn, I'm seeing parallels to my recent breakup everywhere. =P