[header] How to ignore your feelings for someone that doesn't feel the same [title] Allow yourself to feel upset. [step] While you may be tempted to push your feelings down and pretend they don't exist, this is only a temporary solution. Feelings don't just " go away " if you ignore them--they come out in other, usually destructive ways. 
Give yourself the time and space to express your sadness. [substeps] Cry, punch a pillow, sit in your car and scream if you think it will release some of the negativity.