One of my acquaintances might be seeing my toxic ex and I don't know what to do?

I met this girl last sem post break up through my gym buddy. She seems like a nice girl. I broke up with my toxic ex boyfriend after dating for 6 months because he lied to me a lot, gaslight me, owed me 2.5k which I haven’t gotten back and the main reason being his sex drive and the fact he didn’t wanna delete the nudes of other chicks he had while we were dating. The constant turning off location, lying, turning me against my friends and the fact we recorded intimate videos and I’m not sure if he deleted it made me depressed. More than half the relationship I had anxiety attacks, I self harmed, lost 10 pounds cause I wasn’t eating food for days. Now this girl and my friends are all sharing our locations. 6 months post breakup, I noticed she was following him on Instagram so I asked her randomly if she knows him and she said it’s someone she knows and asked me why. I told her he is my toxic ex who owes me money. She asked if I got it back and I said no he ghosted me. She said she’s sorry and that she’s glad I’m doing really well and stayed strong now. Then I told her I don’t want anyone to go through what I went through in the past. Few days later she was following his public account as well. Now I seen that she went to his college yesterday. When I texted her (regarding this party we have this week) and I asked her if she was on campus cause I haven’t seen her in a while, she said she was out and she might meet me tmr. And then proceeded to turn off her location till she left the campus.
she’s a nice girl and I don’t want her to get hurt. She doesn’t know about the other stuff aside the money but there’s a chance that if I tell her she will telll him what I said and he can use stuff against me or spin it into another story and lie to her. I’m uncomfortable that firstly it’s my ex, secondly she could get in deep trouble if she sees him. I don’t know what to do.

Updates
1 y
I seen her on campus and waved at her, not sure if she seen or she ignored me but it looks like she ignored me more specifically so I guess she will have to suffer eventually?
One of my acquaintances might be seeing my toxic ex and I don't know what to do?
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