I just found out my friend I’m playing with cheated in our valheim playthrough

I’m playing valheim for the first time ever and it’s a beautiful game. An online friend of mine saw i was playing and he asked to join me so i said yes. I’ve played 50 hours atm and he’s played 20. I’ve only discovered the meadow/Black Forest/ mountain/ swamp biomes.

Last night I thought I would log in before bed and make a bronze weapon for him and leave it in his chest at his house. Imagine my surprise when I open his chest and he has perfect stacks of every item we have found. The give away was when he had maximum stacks of ancient seeds… he never explores so I know he never would have gotten 20 (can’t remember atm of the max stacks of that is 20 or 50). Then I checked my chests and whatever cheats he’s used has also affected all my items also… everything is fully stacked like my gold is now 999/999 instead of around 200 gold I had collected.

I confronted him and he lied to my face until I showed clearly he cheated… I’m devastated. I feel like my playthrough is tarnished in a way.

Is there any way to permanently delete items? He has so many chests and I destroyed his house and everything as he’s not playing with me anymore… but all his items are just lying everywhere and it’s really driving me insane. Do I really have to just collect everything he has and throw it into the ocean?