What are the feelings and why do they have them?

APATHY: Lack of interest or concern, especially regarding matters of general importance or appeal; indifference. Lack of emotion or feeling; impassiveness

well firstly, does she know you have feelings for her? if not then tell her. and even if you think she does, tell her again. if she does know for sure, try talking to her about the situation. this...

it is "Hard Feeling"

well...... look for another girl that likes you if they don't ....then just stay single . or maybe she'll take u and you'll be happy if she does not then sorry buddy

Yes, in the sense of being an emotional condition, often called a "feeling."