Does he has feelings for you?

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...

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

You are feeling your arteries help pump blood through your body

it is "Hard Feeling"

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