Also keep in mind that even if they do get along at first, it may not last. You'll need to always have a permanent back-up cage in case they fight later on.
I used to worry about my chin getting lonely too, but I've had him for over two years now and he seems just fine. He loves getting attention from us, and he has his fleece buddies if he needs some "companionship".
Another thing to keep in mind is that trying to bond him with another chin will affect his relationship with you. From what I've read, if it goes well, most chins are no longer quite as affectionate with their owners, they'd rather spend time with their chin buddy. Not to mention that if it doesn't go well, it may affect how much he trusts you. I tried to pair up my chin once, and they didn't get along (the other one attempted to attack my chin). My chin didn't want much to do with me for weeks after that, and made it quite clear that he didn't appreciate me allowing another chin near him!
As long as you have toys and such to keep him entertained, and continue to play with him and give him affection on a regular basis, he'll be just fine. My boy is!