<human>: Can you succinctly summarize the text in 1-3 sentences?

Hi /r/Advice, I am going to start off with saying I am **terrible** at writing so I apologize in advance for bad grammar and/or bad story telling.  

Quick back round on me: It's my senior year of high school. I am 17. Not perfect, but pretty good looking.  I'm not one of the popular kids, but I am not unpopular. 

Quick back round on her: senior year of high school. 17. Extremely pretty. Very popular.

Ok so freshman year my best friend, Karl, starts dating this girl, Milee. It goes on for ~1 month and she breaks up with him, says it's because he is too clingy.  Found out later that was total B$.  I stop talking to her for around 9 months. Although after that through the end of sophomore year and beginning of junior year her and I get pretty close.  2 weeks before senior year starts she seeks me out we mess around and end up dating.  After just a week she is lying to me and pretty much cheating on me.  Following this I break up with her tell her off and we stop talking. Fast-Forward 3 months, she starts talking to me again.  She explains to me that what I thought was happening wasn't true, verified by karl who has remained friends with her throughout this time. Well, Milee and I start talking and getting close again... After just 2 weeks of talking we begin to hangout again. We have sex and it's my first time. The day after this she tells me she isn't over her ex-boyfriend. The ex-bf lives in New Mexico, we live in Minnesota. She has met him 3 times irl. Is it right of me to be angry that she didn't tell me sooner? That she likes this guy that she doesn't truly know? -Or- Can she really know him that well with only knowing him through text and Skype? I am thinking of just blowing her off again and this time really never talking to her again. What do you think reddit?
<bot>: High School hottie used me for sex took my virginity and told me she is going back to her old bf from over 500 miles away. Is it okay for me to never talk to her again?