Friendship advice?

I know this is not like a sexual relationship, but I need to know if I’m overreacting and should just not say anything or if my emotions I’m feeling now are valid.

So here’s the deal, my best friend of 6+ years dated this guy, I hated him. He had a past history of drug use and she said prior to dating him she didn’t want to get involved with him because she can’t trust him because he still did pills and coke sometimes, they started dating, he had herpes and has known for years and never had protected sex with her and gave her herpes and lied about knowing he had it until one of his friends told her he has known he had it for years and just neglected to be safe with her even after she asked if he had been tested, mind you this is a 30 year old man. They broke up because she found him coked out naked at 2 am and had been doing pills still, and then she found out he knew about the herpes and then got back together with him after finding out he lied? They continue to date, she acts very shady, hides things from me and lies when I don’t even ask her about things, this continues and tell her I’m moving out because of it. A few days later she finds nudes on his phone from his ex and they break up because he had been cheating. So I stayed and didn’t move out. Fast forward maybe two weeks later and they are sleeping together again and she just out right lies to me about it when I never questioned her in the first place, and I found out on accident and she blew up on me that she didn’t tell me because she didn’t need a lecture (I don’t lecture her I’m very supportive and keep most of my feelings about him to myself) but she said that I’m defense of getting caught in lie. This continues she swears she’s not sleeping with him again and then I go to take a shower after work last night and she’s bringing him home and they are sleeping together again. She has no respect for herself and for some reason values him more than our friendship and does so by cutting me off and lying to me until she needs me either emotionally or physically and I’m really done. I want to tell her I don’t want to be friends any more and our living situation should just be roommates and very separate as I can’t move out anymore after canceling those plans. Am I overreacting?