Another "great" trader i met today.

I'm not disagreeing. You got a raw deal. However, as stated in the FAQ:

Chat Room, Forum, and Site Etiquette:

The chat room or forum is NOT used for trading items/games.
Please avoid creating topics for political discussion.
Do not link to any referral programs.
Puzzles: Do not leak, post answers, suggest hints, or directly link to the prize/giveaway.
If you would like to include some self-promotion in the chat or forum, please run it by a mod first.
Be considerate of all users at all times related to the site/chat, etc.
Do not beg or offer to trade in chat or forum. Do not beg for games in chat/forum or PM SG members from chat for games.
Always thank submitters. Thanking is not required to enter a giveaway.
**Please do not call out users in the forum or chat.** Submit a ticket in the Support Forum.

I realize that you were treated badly, and I sympathize. I also respect your intentions, but I'm letting you know for your own sake that this could be construed as a violation of the rules so that you don't get in any trouble. I recommend looking through steamtrades and/or the Steam trading forums to see if you can cut your losses by finding another trade. Best of luck.