My fiancee messaged another guy for a few months and had lunch and walked at lake and she kept it secret for a long time what should I do?

Robert123456789
She keeps saying it wasn’t cheating but admits he kept telling her to leave me to get with him and that they would be such a good couple if things weren’t so complicated. Need advice on what to do…
My fiancee messaged another guy for a few months and had lunch and walked at lake and she kept it secret for a long time what should I do?
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