I was fooled by my girlfriend!Who can help me?

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I love my girlfriend very much,but suddenly she said good-bye to me yesterday.She told me that she hadn't loved me and had felt in love with another boy who is more outstanding than me.I think we're always getting along with each other very happy.I can't understand why she does that.I saw some intimate messages from a boy,but i believe her.Until now i find i'm a foolish boy and was fooled!I'm in a low mood now.