Me and my ex broke up in September, we were toxic together in a relationship but we've always gotten along as friends
Well we hadn't spoken for a couple of month, just both busy with our lives, but we started talking again a few days ago
I went over his last night, just for a catch up and a bit of a movie/takeaway night
Things happened between us which I was fine with since he'd told me he wasn't seeing anyone and hadn't slept with anyone in months
Later on we were watching another film and I saw someone pop up on his phone, the way he acted about it made me suspicious
so this morning (I stayed since it was too late to go home and I don't drive) I done some snooping and found out he's actually been talking to this girl for a while and they had sex Tuesday night..
I'm not at all interested in being in a relationship with him again, but I don't know if I should warn the other woman or just leave it alone?