I feel like an idiot 😭

So I had a fling with a guy that I met at the club and we’ve been seeing each other and having sex for the past month. I’m leaving the country in a few days and won’t be coming back here and yesterday was the last time I will be seeing him. But before I left his house, he said to me “Thank god you’re leaving today! My girlfriend is coming to see me next week and I have time to clear all evidence of you”

I had no idea that he has a gf and I feel so dumb and stupid for not asking him if he’s single. I slept with someone’s boyfriend and I feel like an idiot!! I feel so bad for the gf and ugh he is such a dick and I should have hid my bra/panties somewhere he wouldn’t know so that his gf will find it and know that he’s a lying piece of shit and a fuckboy.