<human>: Give me the gist of the text in a nutshell

I fell pretty hard for this girl last year, and it was a long distance relationship for a while. We met through a mutual friend in an unlikely location, and I didn't want her to slip away. So we ended up dating in late December of 2011. Upon New Years eve of 2011, we were both bummed that we were in different states and couldn't celebrate with each other. So we promised each other that we would save our new years kiss until we could be with each other the following year. She asked me if I would be upset if she made out with other guys on new years eve, and I said, well, of course we're dating now. Sure enough, that night she kissed 2 guys. Meanwhile, I was just sitting at a party in a different state thinking about her the whole time and didn't hesitate to turn down new years kisses, until I received a drunken phone call from her telling me that she in fact kissed 2 dudes, one of whom was trying to get with her. I was pretty crushed by this, and even more so that we were only dating for two weeks. She was super apologetic about it the morning after, but to this day she shrugs it off as "it was only a new years peck, not a big deal." This has seriously made me subconsciously bitter, and even though she's been amazing to me ever since with minimal mishaps, I feel like I've been using that to justify being mean to her sometimes, because I still think its never OK to do something like that. Nowadays, I transferred to the same university as her because they are also paying for my school, but I admit that was a fucking stupid move now. Am I taking this overboard?
<bot>: I've been dating this girl for a year, after our first two weeks of dating she kissed people on New Years Eve, I've been bitter about it ever since because she still thinks it's okay.