Is my girlfriend cheating on me?

So I think my girlfriend my have cheated on me. She went away on a trip to see her friend (a guy). We usually text or talk every day. This turned into her taking a long time to text me back and ignoring my calls. It wasn't like I was over texting her just out normal amount. Then when she gets back she ignores me and won't see me. What is going on?
Is my girlfriend cheating on me?
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