[header] How to get someone to stop crushing on you [title] Make it absolutely clear that you are not interested. [step] Be polite but be clear and firm that you don't return the feelings for this person. Be kind but don't give in to the person just because you feel sorry for them. 
If this isn't what you want, then it isn't what you want. [substeps] Say something like: " it's flattering to hear you say such a nice thing to me.