How would you feel?

So, I'll give you a recap of a few things just to give the whole feel. 
So I just started my freshman year of college last week. My boyfriend lives 2 and a half hours away. So we FaceTime and snapchat and text to make things better. Well Friday I went to get my books. And there's issues with financial aid. So I've been stressed over that. My sociology class already seems like hell. And I have no choice but to take this class this semester. 
Anyways. So I've been stressed and moody. And upset. So I asked him Saturday if it would be possible if we got FaceTime or a phone call, and one of his friends was over so he was like, before I go study in the morning I'll call you baby girl. Well. This morning comes. No phone call. No biggie, whatever. So we've been texting back and forth. And such. Then he didn't text me for like 2 hours. Which no biggie. I understand we can't just sit and talk all the time and he has a life like I do. Well I go to get on Facebook. And first thing I see is a picture of him and this girl. Which you can tell its at their school for some frat and sorority event. Normally I wouldn't be pissed. But he didn't even tell me like hey babe I'm going to do this so I may not get back to you quickly. It's just no response then bam picture with some girl. 
Then he texts 10 minutes later. With the weakest response to what we were talking about. 
Sorry about this. I know it's long. I'm just upset. And frustrated. And don't know how to tell him I'm upset.