<human>: Can you condense the text into three sentences or less?

Last night, my girlfriend of a couple months came over to hang out for a little while at night. Everything the past couple days have been great, I attended her graduation, we were hanging out, and now today everything's different. She came up to my room and we're just relaxing and hanging out, and then she says "Why are you going to that music festival?" This music festival is something that she has known I was going to for at least 1 1/2 months. 

She really doesn't want me to go for what seems like no reason, although I'm sure it has something to do with drugs. 

Anyway, she's freaking out with me and after awhile of this she just stops talking to me all together. 

At this point I'm trying and trying to get her to talk to me and calm her down, but nothing is working. Out of nowhere (this is what really destroyed me), she pulls out her phone and texted some dude that use to like her and had made a big deal about much she doesn't like him. 

I'm honestly at a loss for words, and have idea how to react. She currently won't text me or anything and I'm debating on not whether to throw in the towel and give up or just not go to the festival.
<bot>: Going to a music festival is making my girlfriend so upset, she won't even talk to me, but will talk to another dude instead. Don't know how to respond, I've never been in this situation. Please help