This history sounds a bit not realistic. Hence here private message can be checked by admin and mods... So they can see if you are telling something real or not...
But the real question is: why to give random passphrase to some one?
It should be 479001600 combinations possible with 12! not easy at all to test all these combinations and verify if these address are loaded...
Of course you can go to your local police and provide proofs of what happens.
You know how valuable your bitcoin stored in your wallet, and you end up trusting another person for your passphrase. You’re completely insane. But just like others have been saying, your post is like fabricated and no one’s gonna fall on that.
However, I’d still answer your question so that it should also raise an awareness for others. Your keys, your coins, and that should never be disclosed to others, regardless if it’s a new found friend or an old, trusted friend. And if ever this happens, go report to the nearest police station. I know they have an idea for that, but I’m not sure if you can still retrieve your bitcoin or just gone by the wind.