Just send your coins to the new wallet.
Also, just leave that old wallet that has been compromised. If there are still some balances left, that's what he must do, send it asap to another wallet of his.
How did someone get your seed phrase?
Based on his story, this is how it went.
I made a mistake and bought Retik Tokens in presell which result that I probably won't see nothing from it, on the other hand I know someone who can do something and get my eth back(eth which I bought these tokens with),for that matter he need the control (with my wallet secret phrase).
I know it sound extrmely scammy but ,worse case is he will get the crappy retik tokens(currently hadn't been claimed yet...and plus 14$)...
On the other hand , if it not a scam like I can get my eth back...he asked me to move all my assets from my wallet before getting control of it. He was honest on that thing