How does the NC rule work when you broke up with the person

[problemchild]

I broke up with my ex girlfriend a month ago. She kept calling me and texting me after the breakup. I never contacted her because I felt that there was to much going on in her life and she need space to figure things out. During our break i found out some secrets like she was living with another guy in her one bedroom apartment because he was able to help her pay rent, but i couldnt. She has had a hard life i understand but she never mentioned this to me. The person i found out from informed me that she was afraid she would lose me if i were to find out, but that her and this guy used to have sex before she met me. IDK i feel that she should have mentioned this from the being. We were dating for months. We were officially together for 3 months. During that time we broke up 5 times and got back together, but i felt that it was because i knew she was hiding something. I also felt that it was killing her on the inside. I confronted her about the situation and she said she doesnt regret what she did. I feel like if you are living with someone in your apartment then you are bound to have sex. From what our mutual friend says he believes that she was faithful. I havent talked to her or seen her since i confronted her about the situation which was almost three weeks ago. My questions are how does the NC rule apply when you want the person to come back to you, but you broke up with person? Especially in my situation when i found out things after the breakup. Also, will she ever contact me again and try to come back to me? I know right now she is going through some big legal problems in her life all of which happened after i broke up with her which seems to me like GOD was looking out for me. I really did fall in love with her and tried my best to over look all the bad things i saw, but finding out that another guy was living with her really took a toll on me because now i don't know if all the times she told me she loved me and cared for me really was the truth or a lie.

[Flier]

She lies to you and cant be trusted. She may love you, but relationships with liers are toxic in my opinion. The fact that she had a hard life does not change that.