it means that you are his girlfrend
It would depend on who is using the term. Some people have open relationships but still consider the individual to be their lover (girlfriend or boyfriend).
Of course he loves her. When a guy says he would date you if he didn't already have a girlfriend, he is letting you know that he does love her and that is why he isn't dating you or anyone else. He is telling you that if he didn't have her as a girlfriend that he may consider dating you.
if by they you mean THE GRUE!!...then yes, they do have a girlfriend
I have a girlfriend
When a guy says he would date you if he didn't have a girlfriend, he is being nice and letting you know that he is already taken and that you would be someone that he would consider dating if he wasn't already with someone else.
First off who is Nina and what do you mean by girlfriend
It means he likes but has a girlfriend.
weird
It depends if he knows you like him. If he does, then he may have a slight crush on you. If he doesn't, he might just consider you guys good friends. Hope that helped!
it means you do not trust your girlfriend.
Selena Gomez
It means your girlfriend is greedy