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From what you posted, it sounds like both of your accounts are compromised.
Both of you follow the steps...
Scan for malware. https://www.malwarebytes.com/
Deauthorize all devices https://store.steampowered.com/twofactor/manage
Change your password on a secure device.
Generate new back up codes. https://store.steampowered.com/twofactor/manage
Revoke the api key https://steamcommunity.com/dev/apikey
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 for your Mobile App
Revoke the API key https://steamcommunity.com/dev/apikey (there should be nothing in the APIKEY, that is how they are controling the trades)
Follow the advice as given above, by Wolf Knight and cSg|mc-Hotsauce.
his look : https://gyazo.com/f825cc84a28ebed44425f25a30892210
no one on the forum can help you, we can only tell you what you need to do to fix the problem
scammed items are not returned.
after you get this fixed, figure out how you gave away your log in and STOP IT