I traded a Steam Key for The Showdown Effect for the Borderlands key with this user, I offered my key first because he seemed nervous, then the key he gave me didn't work. He asked for some time to sort it out, I said okay. Then he defriended me. Don't trust this user.
If you have proof (screenshot or a copy of the chat log perhaps) you should report him through here and on steamrep.com.
Thanks for the advice, he defriended me though and I didn't think to take a screengrab :( Are Steam chats logged anywhere do you know? I'll google that.
User says he's been trying to contact me???? Contact me then multitruehero!!! You can even contact me right here if you're actually finding it hard to get hold of me on Steam, even though I'd added you as a friend about 15 times!!
I have the code for Borderlands.