I found out my girlfriend lives with her ex of 3 years- and I just now found out?

Anonymous
I want some thoughtful advice here. I have been dating a girl for 3 months. She lives with 2 male roommates. I thought nothing of it and thought it was cool, they are friends. She sends me a text earlier this week reading: you know that guy I said I dated 3 years, 4 years ago? He is my best friend, I see him every day, I live with him. He is my roommate. We know we work best as friends and not in a relationship. They work together too.

I didn't respond. And later told her to f*** off the next day over the phone. I was kept in the dark about this the whole time, while even hanging out with the guy. I felt like this should of been disclosed so much earlier. I find it very weird and strange regardless of when she told me but really? I don't think any romantic feelings are there but I can't imagine living with an ex whom I've had sex with. And then claiming them as "my best friend". The text while I was at work was very immature. I had just told her an ex of mine tried to contact me a few days before too.

Should I listen to her? I am curious as to why it was a secret to begin with. Or should I not give her any more chances? I was really into her before this all went down. I want to make things work but don't know if it's even worth it. What would you do if you were really into your current boyfriend/girlfriend and this happened?
Updates
+1 y
I welcome even more comments! I've appreciated those that have commented on this issue very much. I realize maybe I am being a jerk, but also feel I have every right to be.


I guess this is just really complicated. I will be taking a break and letting things cool off before doing anything. I hope she does the same and maybe we can someday come to a resolution on the situation. If not, I will be getting on with my life regardless.
I found out my girlfriend lives with her ex of 3 years- and I just now found out?
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