I'm glad you found the other one!

I know this thread is a few days old, so I don't know if you got another hamster yet or not, but usually hamsters do better alone. The exception is dwarf hamsters, but even then it could be difficult introducing a new one after he had been with the other hamster for so long.

Try spending lots of time playing with him so he won't be lonely. If you think he really needs a friend then introduce them carefully and on neutral ground (like, not in the old hamsters cage).

I hope that helps.