It depends what the actual issue is your not giving enough detail.
Are you spending more time with your girlfriend then your friends.
Like is it one of those things like if they don't call you they'll never hear from you.
Friends can make mistakes to complete give up on him cause of that sounds silly.
Saying that he not your real friend is kind of silly you can say that for anything.
Things are not as black and white maybe try to talk it out a bit more.
Also how deep is your friendship if you really gonna throw it all away.