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, 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
Boyfriend and girlfriend
you already answer that to your self
Start by asking him.
Well either the girl or the boy in the relationship have asked each other for example: " Will you be my girlfriend?" " Will you be my boyfriend?" Etc......... or just a plain" I love you"
Talk to him. That is really all that you can do.
Not that i know of but you can be as soon as they are teens you can