<human>: Could you distill the essence of the text into 1-3 sentences?

Hey Reddit, so I'm in a bit of a predicament.

About a month ago I broke up with my girlfriend of 9 months . I had sometimes suspected she was cheating on me, but never caught her and she was always calm and reasonable when I confronted her about it, so I always let it go. Anyway, I'm currently forced to live with her for the month of June (we had made housing plans before I broke up with her). While she could theoretically live at home, I wanted to be the gentleman and make sure she wasn't homeless.

Anyway, while she was getting changed she left her phone in my bed. And although I never invaded her privacy while we were dating, curiosity finally got the better of me. What I found was somewhat disturbing. A series of text conversations dating back to BEFORE I broke up with her. The real kicker is, it's not just one guy, it's four. 

I feel so disgusted with her right now. I feel completely taken advantage of and that I wasted 9 months of my life with her, probably getting cheated on the whole time. What the hell am I supposed to do? Do I confront her about it? Do I wait out the month? I feel like the next time I see her I won't even be able to look her in the eye.
<bot>: Found out ex-gf (who I'm currently living with) had been cheating on me with 4 different guys. Wat do?