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They do not act as middleman, they do not act as an item verification service. Those are all scams. Without exceptions. Report the profiles involved and decline the trade.
Then the scammer is already logged into your account.
Do the following steps to kick them out from your account:
1. Scan for malware https://www.malwarebytes.com/
2. Deauthorize all other devices https://store.steampowered.com/twofactor/manage
3. Change passwords from a trusted/clean computer.
4. Generate new backup codes for your Mobile App https://store.steampowered.com/twofactor/manage
5. Revoke the API key https://steamcommunity.com/dev/apikey (there should be nothing in the APIKEY)
6. Change password on your email account. Enable 2FA if you don't already have it activated.
Scan for malware https://www.malwarebytes.com/
Deauthorize all other devices https://store.steampowered.com/twofactor/manage
Change passwords from a clean computer
Generate new backup codes https://store.steampowered.com/twofactor/manage
Revoke the API key https://steamcommunity.com/dev/apikey
Stop using shady third party trade sites or clicking suspicious links.
Do each of the steps.
What happened is your account became compromised, most likely through a third party site. This well known scam then requires you to authorize the trade giving your items away after you allow them access to your account through either malware, or giving away your details through a phishing fake login page or other trick used by those shady third party sites.
The way it does this is after it gains access to your account, a bot waits until you send out a trade offer, and then using the access you gave to them, their bot cancels the trade, changes a bot account to match the name and profile picture of the person you wanted to trade with, and then sends a trade giving your stuff away for free.
The scam depends on you ignoring all the warnings, such as "this user is not on your friends list", "this user has a similar name to someone on your friends list", their items missing from the offer, the big "you will receive nothing" text, the fact that they have the wrong level, wrong "has been on Steam since" date (usually obviously too recent to make sense), and a few other obvious warnings. It only works if you're not even looking at what you're doing. Sadly, an awful lot of people don't care enough to verify the trade is what they are expecting, so this scam continues to work.
Valve will not return items you gifted away to the scammer as a result of ignoring all the warnings. https://support.steampowered.com/kb_article.php?ref=9958-MJDG-3003