I accidentally told my best friend I love her. Help?

We were at our graduation thing at Uni, she hugged me for a really long time and I accidentally said “I love you.” It just sort slipped out? There was an awkward moment of confusion and then we just sorta slipped away to talk to other people

I do love her, but I don’t want to date her because I don’t think I’m capable of holding a proper relationship and I don’t want to lose her as a friend. I just don’t know what I should say to her?
I accidentally told my best friend I love her. Help?
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