-Rep I don't know what happened, we make a deal to exchange one of my games for 2 of his, I added him, he sent me the key first and when I tried it it said the key was region restricted and it won't be activated in my account. I let him know that the key didn't worked and he said for me to send the proof that the key didn't worked, which I did. After that for some unexplainable reason he just unfriended and blocked me, saying that I have "stole" his key that that I'M the one who unfriended me, which was the complete opposite.
He ended giving me a negative rep on my page saying that I stole his key and after some quick conversations on the steamtrades comments he eventually decided to unblock and add me again, and by my own mistake I decided to take a risk and trust him and I sent him my own key, just for him to once again unfriend and block me again and to also close the post comments, so now it's basically impossible for me to contact him, and there's a very high chance he stole my key on purpose. So yeah...
You can see the whole conversation on Steam right here:
This is the conversation we had on steamtrades:
I'm willing to solve this problem with him if he sees my negative rep and add me on Steam without unfriending and blocking me again. But as long he stays silent this negative rep also stays on his page. I'll never block him so he can add be whenever he's ready.