Accepted Report: 76561198046923152 (KEVO)

Victim:
steamID: [F2P]Arf (Playing with 360 pad)
steamID32: STEAM_0:1:15739238
steamID64: http://steamcommunity.com/profiles/76561197991744205
customURL: http://steamcommunity.com/id/ArfJason
steamrepURL: http://steamrep.com/profiles/76561197991744205

Scammer:
steamID: Rainbow Kevoo
steamID32: STEAM_0:0:43328712
steamID64: http://steamcommunity.com/profiles/76561198046923152
customURL:
steamrepURL: http://steamrep.com/profiles/76561198046923152
(seems formatting broke here?)

Screenshot: (sorry I only have this, unless steam has logging)
http://i.imgur.com/DrgtJ.png

Description:
The scammer added me on a random server, expressing interest over a few items, we traded properly, and I think even to a loss to the scammer, so I had him on good faith.
Today, I relayed him a personal story, and how I felt a bit down, and he assured me he stood up for me and everything. Then he changes the subject to trading. I tell him I'm not in the mood, but he insists, and thus we end up in the trade window.
I had 5 ref and 1 rec up for his following items: High five taunt, Desert marauder (painted), Festive stickylauncher, Frying Pan and Flair!
At first the trade seemed to go through but a connection error at the last second prevented this (I believe he closed the window or terminated the trade somehow, but at the time I wasn't entirely sure). We try again and he tells me he can't see my items, and I can't see his. As a side note, you know that when people update their offerings, the window adds a little text saying "Updating X's offer" or something to that effect. Well, it was spazzing a bit, but I still couldn't see them, as you can see on the screenshot. After much goading, I caved in to it, and after trading he disconnects (Removed me from his friends list), and changes name. (EDIT: Oh hey, he changed his profile pic to a cyanide and happiness panel of some dude laughing at another, that's quite appropiate!)

And that's about it. I really don't mind about the items, what bothers me is that I got suckered by trusting him with a shitty day story, and getting pulled around by it.
Thanks for any help, I appreciate it a lot.

I know this might not help my case, but I can't find the editing button anywhere, and forgot I had this open on an mspaint:
http://i.imgur.com/yRsRQ.png
Maybe it can help shed some light on the situation.

Screenshot of trade history please

(You go to your inventory > View Inventory History > Print screen and upload the image to show you've traded with this guy)

Thank you!

http://i.imgur.com/65oOZ.png
Wow, that's pretty useful, and I never knew about it, thanks!

Marking now, thanks for the report.