Dumped for another guy / rough break-up. Advice?

So when my girlfriend and I stated dating, she at first was hesitant because she said she didn't want to hurt me like she did her previous boyfriends. She said she was a little messed up, but at the time i didn't think much of it. The first couple months of the relationship were great and we thought we were perfect for each other. Then a few weeks ago, my girlfriend told me she had developed strong feelings for me. She wouldn't outright say she loved me, because she said she was scared to because she had been hurt in the past (just got out of a serious relationship a year ago). But that was the peak in our relationship- when we first told each other how much we cared for the other. She would say things like she was lucky to call me hers and she wouldn't know what she'd do without me. At that point, we'd been dating for a few months and everything was going really well. We met in college and now had to do a long distance thing in the summer since we live a couple hours apart. About a week later, something changed. We hadn't seen each other in a few weeks, and she suddenly wouldn't talk to me. She wouldn't text me or call me and basically ignored me. When I finally did talk to her, she said she was going through her own personal issues. She said she was in "shutdown mode" and didn't want to talk to anybody. She didn't know what she wanted anymore and said she didn't deserve me. She'd been abused in her childhood and was now doing some self-harming, but I said I was there for her no matter what and tried to do my best to make her realize she was important. After about a week, I went to see her and could obviously see she was not herself. The whole weekend we spent together all she did was sleep. She wouldn't initiate any hugs or anything intimate and basically ignored me. The last night I was there, I began getting intimate with her but saw the expression on her face and asked what was wrong. Her response was she just wanted to be fair. After awhile, I finally got her to talk to me and she said she was going through a funk and didn't have any feelings for me or anyone else. We decided to break up for the time being, and then see in a month when we got back to school if things change. She also said that if we had been able to see each other more often over the summer, she knew we'd still be together. I then found out that after we broke up, she immediately began dating a guy she works daily with. I remember she said people at her work thought they should be dating, but she kept telling me they were just friends and I had nothing to worry about. I wouldn't be surprised if she cheated on me during that time she was ignoring me, and that hurts the worst. It didn't seem like she was that kind of person. The messed up thing is a few days after we broke up (when she was dating the new guy), she put facebook pictures up in shirts I'd bought her- it kind of felt like she was throwing it in my face. This was my first actual relationship because I guess I'm kind of picky on who I pursue. Even though it has been my only one, she was kind of perfect for me and I fell for her. I'm still having trouble believing everything that happened. Any advice on my situation or wise words on moving on would be appreciated.

hey bro she pointed somthing out to you that should of been a red flag.. she said she dosent deserve you out of all they thing shes told you that was the most truthful. she was right on with that. women are the most confused people on the planet. and quiet honest there blind to our feelings most of the time. but you will find the right one just keep your head up and leave this in the past bro. there still good guys out there like us stay strong we are a dying breed.