guys, I just gambled like 200$ of my girlfriend's money, I don't know what to do or tell her and im in no position to pay her back currently. Any advice please?

So, my girlfriend has been my biggest support, I live with her and we literally do everything together. So , her birthday is coming up in two days, I'm a developer, and I haven't found any sort of jobs of late, so I decided to try gambling to sort of multiply the money, It went horribly wrong. I don't know what to do or tell her rn, cause ik she's going to kill me.