This girl says she likes me but doesn't want to ruin our friendship, what do I do?

this girl I'm good friends with says she like me, but is afraid that if when we break up eventually, it will ruin our friendship. how can I convince her if that won't happen, but what if it actually does?

is it better to have something then lose it, or to never have it at all?
This girl says she likes me but doesn't want to ruin our friendship, what do I do?
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