My girlfriend cheated on me, any advice?

Anonymous
I was away to a music festival when it happened. She was drunk and her side of the story is a guy tried to kiss her and she backed off. Other peoples story was she kissed him (I don't know who to believe) When I found out I dumped her but after a while I have started to really miss her! We did have a talk and she was in floods of tears. I didn't want to take her back because "once a cheater, always a cheater" but as soon as I hugged her, I thought how much I missed her. I do believe she is overly sorry but whether I can trust her I don't know. Should I start meeting her again and see how it goes...or any advice please.
My girlfriend cheated on me, any advice?
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