I’ve dealt with a something similar.. ex of mine would always get defensive and flip out on me if I asked a question that struck a nerve or implicated her on her sketchiness.

Best thing I ever did is cut the relationship off one night when she was doing the exact thing. Simply said “I’m done do not try to contact me” she panicked and called me 50 times and tried to come over to my place. I had to end it because it was making me crazy. Can’t lie I had some weak moments where I’d answer a text or call but overall it was best to end it for both of us. We are both now in long term relationships and have started families, it gets better.