What does an affair mean? Can girls be ambiguous?

Ambiguous is kissing more than a good friend, but farther than a lover.

Ambiguous is a little brother-sister friendship, but I dare not be commensurate with brother and sister. Everyone secretly understands that this relationship can't be as simple as two brothers and sisters.

Ambiguous is,

You will often wait for him to go online on MSN, and whenever he doesn't go online for a few days, you will start to worry.

Ambiguity means that you will pay attention to his information from time to time to see if there is any update, and whether he has given you any hints between the lines.

Ambiguous, there is a feeling, however, this feeling is not enough for you to develop a formal relationship.