Help I need advice

Okay so I recently got out of a really really bad abusive relationship and a lot of it stemmed from this one girl who was constantly trying to start drama and tell my boyfriend things that weren’t true which would cause fights, so it drove us to end things. It has been some time and I grew a lot and started hanging out with a guy in the same social circle of all of us but definitely not close w anyone I’m close with and is not close with my ex. Things are going great until one morning the girl I was just telling y’all about starts to FaceTime him!!! I was like ummm. So now I’m not sure what to do, it truly turns me off that this girl and my new guy talk and know each other just because she caused me so much pain in the past it took a lot for me to recover. Obviously I can’t tell this new guy that and I certainly couldn’t tell him to stop talking to her or anything so now I’m torn. Do I continue with this guy and just hope for the best or should I acknowledge this red flag and part ways with this guy before she can cause anymore drama for me. I truly wanted to put that old relationship and drama behind me but here it is. I worry that if I stay talking to this guy it means I’ve learned nothing :/ this new guy is very nice though I’m just not sure what I should do from here without looking crazy. Leave or stay please help.