How do you break up with someone who's in love with you without breaking their heart?

I'm in a relationship with a lovely girl, she's perfect, she's caring, supportive and understanding, but I don't love her, maybe something is wrong with me. But she just told me that she loves me and now I'm scared to tell her that i don't feel the same and never will. What do i do?
How do you break up with someone who's in love with you without breaking their heart?
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