Wallflower (n.)
1. A person who because of shyness, unpopularity, or lack of a partner, remains at the side at a party or dance.
2. Any person that remains on or has been forced to the sidelines of any activity.
"So you two sleep together? "
"We have sex. " he said.
"Same thing."
"Well yeah. "
"But you hate eachother? "
"Hell yeah. " we said at the same time.
I hate him so much I'd kill him in a heartbeat.