I have a friend who I’ve been friends with with a very long time. My girlfriend has already shared with me her distaste for my friend, and asked me a long time ago to stop hanging out with them. I told her that I am not going to do that as I’ve known him forever and I’m not going to cut him off just because she doesn’t like him. She understands this and agrees with me, and told me she’s fine with it. 

Earlier today, I make plans with this friend and also tell my girlfriend about it. She tells me that it’s cool, and that she hopes I have a fun time blah blah blah. 

20 minutes before my friend is supposed to arrive she calls me and tells me that she’s really stressed about school and she really needs someone to be there for her. I tell her I’m sorry, I can’t see you today, but I will always be available for you to text, call, Facetime, what have you. She gets really really mad and tells me that she can’t believe that I value my friend more than her, and I tried to explain to her that my friend was already on his way, and it’s rude to just tell him to go home.  She told me to fuck off and is now very mad. 