Well it would be wrong to lead them on like that, and no one wants to be taken out on a pity dateish thing.
Everyone in the world has to deal with rejection, so don't feel too bad about it.
Just let them down easy, by saying the ever popular "I think we should just be friends." or "I really like you, but only in a friendly way." Or something along those lines.
Its not your fault, and leading them on will only hurt them worse in the future.
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