My friend trying to steal my girlfriend?

-Basically for the last week me and my girlfriend have had a really bad argument

Ever since we started arguing it seems that my "BEST FRIEND"

has disowned me and hates me now and slags me of really badly etc removed me from EVERYTHING

i found out a couple of days ago that my girlfriend went round his house to watch a movie with him

just a few things

is it NORMAL to be really mad/upset to the point of wanting to seriously break up with her after many years because instead of trying to solve our issues she spends time with him.

What should i do?definitely have a talk with her and whatever you do, apologize. even if she was the one wrong. girls love that. and tell your friend to kiss yo a** because friends dont do that to eachother unless he is really helping with the relationship, like hes telling her what to do since hes ur best friend. but to be honest i doubt that. if your girlfriend keeps doing that, then maybe you should consider who she really is and think about whats really going on in the relationship cz this isnt a problem that will just go away, it will always be thereTalk to her. Also, try working things out with your best friend. If he leaves you for a girl, he's a ******** and never was your friend.
I can understand why your mad at her but if you really love her then you will find a way to resolve this.
Brah , lick yo friends *** cuz.
Talk to her!
Talk to her and not us.