Responsibility

Jack can have any girl he wants. Except one. The one he wants.

He's been in love with his chemistry tutor since the day they met, but she just doesn't see him that way.

So when a rival of hers approaches him saying he can help, Jack doesn't ask questions.

Very quickly things take a turn, and he wishes that he had. Suddenly she is all too eager to give him, or anyone else, whatever they want.