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Change your steam password, remember it and quickly go to Settings and click deauthorize all devices. That will log everyone out, you and him... and any trade sites if you were into that.
Log back in with your new password, make sure steam guard is on and be careful what you click/install.
(*There are a few more steps, and hopefully one of the guys who has the whole thing in his clipboard will paste it here*)
1. Scan for malware https://www.malwarebytes.com/
2. Check that the email and phone number on the Steam account are still yours.
3. Deauthorize all other devices https://store.steampowered.com/twofactor/manage
4. Change passwords from a trusted/clean device.
5. Generate new backup codes for your Mobile App https://store.steampowered.com/twofactor/manage
6. Revoke the API key https://steamcommunity.com/dev/apikey (there should be nothing in the APIKEY)