She loves you and is flattered by your compliment
it mean he still has feelings for you!! :P
yes
It means that she is happy that you are kissing her and is a little nervous. It means nothing bad at all. :)
Well if she blushes GREEN than that isn't normal.
When a girl blushes is generally means she likes you.
If your girlfriend laughs out loud during a call it can mean one of two things. Either she is enjoying the conversation or she is laughing at you (I mean really laughing at you).
she just saw your beautiful a** when you bent over to pick up your books.
When a man tells another man his girlfriend is lovely and is quality, he is saying she's a beautiful girlfriend.
You can call her by her name directly. If you mean how do you refer to her, there is no special term, just as you said it in the question. She's your girlfriend's sister.
if you mean she is his daughter, then it is your niece, if it is his girlfriend call her by her first name.
They are shy
a condition where one blushes uncontrollably.