Its Over, And I Had No Clue..

This is my first post as I try to find some comfort or outlet for my feelings.

I really dont know how to start as I can't seem to be able to concentrate or put my thoughts together. But this is what happened..

I was in a relationship, would have been 5 years this november, with someone i thought was perfect, in every sense of the word. It was only a month ago when she told me she loved me, she missed me and she wanted to see me. I'm 22 years old, she's 19. A month ago we were talking about finally moving out together and starting out our own lifes. I was always the kind of person that would have done anything for her; 3 weeks ago she left with her mom and her step dad to vegas for a vet conference, during that weekend i stayed at her house to take care of her pets and what not. It seemed we were fine when she came back, but then she started avoiding me, i would only talk to her at nights before she would go to sleep, sometimes only to say good night. Then she told me she had to go to Colombia to see her family and an uncle that was very ill, I was fine with that, but when the time came for her departure, we had already argued and realized we needed a break, so she left without seeing me. A week past and she comes back without saying a word, I went to her job where her step dad is a vet and asked them if they were in, that's when I found out she was already on her way home. By this time I was already depressed and anxious. So finally I call her, and she can't talk, so I told her it was over, but I just said that out of then pain and sadness from my heart. All she replied was "fine" as if it didn't matter. The next day I knew something had happened in Colombia, she can't just change and not love me; so, reluctantly I go into her hotmail account and find E-mails from some guy. He described how he misses her and her kisses, she describes her feeling for him to him and her aunt as well, whom I knew. At the time I read those messages I felt like my heart was about to burst, my face was red, immediately I started crying and finally in an instant I called her. I asked her who he was, as I said his name, after a pause all she had to say is that I should'nt have gone thru her stuff and that we were broken up. The next day, today, I can't stop crying, every room, every thing reminds me of my love for her. I still love her with all my heart, which is why I called her for an explanation. All she had to say is that she wasn't happy, but only a month ago she told me she loved me. I left her messages sobbing from pain, all she did is text me back saying "just move on". As if it were that easy... but I ask myself how can it be so easy for her. The way she talked to me, like if we never were in love, all she wants know is to "find herself".