<human>: So my SO, "red", and I have been dating about a year now. We met in college as we are both pursuing a similar major, and after a series of dates have decided to be exclusive. The other night we were drinking together alone, after a date night. I'll admit I was a little more than tipsy at the point things went sour, but even after sobering up I'm still not sure how to feel.

Basically we got to talking, and it came up that my gf had slept with 8 different dudes, some of them multiple times. At this point, I was just absolutely floored, I had no idea what to say. I just couldn't stop thinking about how an entire year of my life was meaningless, and maybe the most important person in my life could treat me like nothing. 

Needless to say, after a lot of tears and shouting, we decided to end our relationship. I feel like a massive chunk was just ripped out of me, and no amount of stitches can put it back together. But now, as if to add insult to injury, all of our friends are on her side in this. I am being called immature, and stupid for being upset over her infidelity. I met most of my friends through her, so I don't really have anyone I can turn to. I honestly just don't even know what to do, or how to deal with this.

Can you give me the gist of the text in a nutshell?
<bot>: SO of 1 year slept with 8 different men, now she and her friends are saying I'm in the wrong for breaking up with her. Am I in the wrong?