She said she would ruin me?

I have known this girl for about eight years. My friend had a talk with her one night and I was talked about in this conversation. My friend told me that the one night when we were all out drinking that he could see it in her eyes that she was dtf with me. He talked about it with her when it was just them later on and she said that she feels like she would ruin me. Why would she say this? Does she feel like I am to good for her?
She said she would ruin me?
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