My gf will be so mad if she found out but i have to tell someone before i burst

So I have some memory problems, not like clinically but enough to affect daily life. This can understandably really p-off my girlfriend, like if she asked me to sort out her laundry and I forget about it for six hours, or if she like asks me what I ate for lunch and I say I forgot to eat. Like she isn’t actually mad at me for forgetting but it can get really inconvenient especially if it’s about chores and I write so many notes and reminders for everything to try and do better. Sometimes my forgetfulness can get dangerous like forgetting to turn the hob off. I’ve done it many times.
Anyway the story I wanted to say is the other day I went out by myself for a few hours, just to go for a walk. I live in a city so I drove out a little bit and parked up outside a shop, in a pretty busy area. I took myself on a little walk and after an hour I started to make my way back to the car but I realised I couldn’t find my keys. I dug through my bag, all through my pockets, went back to everywhere I went and sat, asked people around me, everything. No sign of my keys. I thought “this is fully gonna put me in the shithouse”, like losing all of my keys including my car key, I knew this would stress my gf out so much.
So after all my searching, I started heading back to my car, keeping my eyes on the ground and hoping for any sign of the keys. When I eventually got back to the car, I realised it was unlocked. I thought “thank god, maybe I can hot wire it somehow” as if I had any clue how to do that. But then I realised the keys were in the ignition and the car engine was still running. I got out of my car, forgetting to turn the engine off, forgetting my keys, and forgetting to lock it.
I was so relieved and horrified with myself at the same time. Thank god I drove further out of the city but it’s not like I was completely isolated, there was still quite a lot of traffic around where I parked. It was for real a miracle that it wasn’t stolen, plus I’m poor so my insurance would have done nothing for me even if it was stolen.

So that’s my confession. I have a horrible time keeping secrets, but this is one story that I’m definitely keeping to myself. Unless I want my gf to have a heart attack, which wouldn’t be ideal. I had to tell someone though