Oil dilution and negative LTFT

The past two days I’ve had some really negative fuel trim at idle only (about -8 or -10 LTFT) I smelled my oil and it smelled like gas but if I’m being honest it’s always smelled a bit like gas after a 1000 miles or so. It’s only been 2200 miles since my last oil change but I figured I’d give it a shot and I just changed it and poof, my fuel trims are back to normal. Any ideas? How would gas be getting into my oil? Why would the negative fuel trim appear so fast?