Relationship troubles

[Aanderson1021]

Me and my girlfriend have been dating for 3 years. I'm going to be 20 in one month and she is 18. She just went to college 750 Miles away, to New York. I live in Michigan. We we're in love.  She is the love of my life and I would do anything for her. I changed here views on marriage and everything. I was her first. Recently, she broke up with me. She told me she cheated on me with a girl and she didn't want to cheat on me anymore. First time she has ever cheated on me. She has always thought she might have been bi sexual but didn't know for sure. So, I have been heart broken, and depressed and not eating or sleeping for the past week. I need someone's advice. Is she experimenting or has she gone lesbian? I know, people don't know for sure. I think even she doesn't know for sure. I just need something to think about. Someone, anyone. PLEASE!