Basically I have been seeing some girl now, before I was seeing her, I had sex with her flatmate (I didn’t know they were flatmates). The sex was awful and I really disliked the girl anyways.

New girl I’m seeing hates her flatmate too, both of the girls aren’t aware I’ve slept with both of them. Wtf do I even do here? Do I tell her and be honest that I had sex with her flatmate? They’ll find out eventually anyways