He will either pretend that the other girl doesnt exist when she walks by
He will act really weird or offended when you ask him about it
Ideally, you would be the boyfriend of your girlfriend. If you didn't know whether you were going out, you could always ask them.
Tell your boyfriend how you feel about it.
she wants to know if your going to break up with her or if your just happy
It could be. A mutual friend is someone you and another person both know. If you and a friend both know your boyfriend/girlfriend, then your boyfriend/girlfriend would be the mutual friend.
well ask her or she will tell you
Well, I think that being a boyfriend, or girlfriend in this case, means that you need to talk to him. If you really like him then you would want to talk to him all the time. The point of being in a relationship is getting to know your girlfriend/boyfriend better. If you don't talk to him, how are you and your boyfriend going to build a stronger relationship? So to answer your question, No I don't think you are being a 'good' girlfriend if you never talk to him.
Well, they're not boyfriend and girlfriend. So, they just know each other.
When he calls you his girlfriend.
how do you know if your boyfriend has cheated
you can't unless you ask him
you already answer that to your self
Start by asking him.