Is it normal that i still want my exgirlfriend back?

My best friend and I were really close and she moved to U.S.A, but we kept talking. I had a huge crush for her and she had one for me. Long story short we confessed it to each other and we started dating, but we had a long distance relationship for a time until she came back to Costa Rica with me. Finally, the day arrived and we were officialy together. Sincerely, she is my dream girl, she is all I could ask for and even beyond that. While she was here with me, she visited her cousins and when she came back a week later; she was different, colder. She was staying here for 2 weeks and then she was going back to the U.S. for some time and then she was coming back again to stay. I went to tell her goodbye at the airport and that was when she broke up with me. I was devastated and wanted to know why. Later on, she told me she always cheats on guys, but that she loved me so much that she couldn't do it to me. I also dicovered she cheated on me with 3 different guys in one night when she was with her cousins. I still kept talking to her and recently she got a lot sentimental talking to me and has constantly anounced something about life giving her a second chance to get him back. I thought she meant her ex, the guy she dated after me, but she didn't meant him and this confuses me. I don't want to be hurt again, but I want to love her again. she is coming back to Costa Rica in about 2 weeks. I want to ask her about that day because I don't know any details about it. What should I do?