College Breakup

I met him in 2009, we were both in high school still(we're both 21 at the moment) and we were friends up until we ended up coming to the same college by coincidence. I'm from a different state, so whenever I needed anything or to go places, he would do it for me, no question. He was sweet, one of the most selfless people I knew. We started dating seriously my freshman year, and we've been on and off ever since, but our love for each other remained the same despite some differences. And believe me, we've been through a lot in a little bit of time, especially for our age. We've always been able to work things out and vowed if we broke up for good, we would remain friends. 

But yesterday, he decided he was done, for good. He was so mean and heartless telling me how immature I was and he acted as if our history together meant nothing. I told him I didn't know who he was anymore bc the person I loved wouldn't be this way but all he said was "things change and sometimes they don't go how you want them to go." He doesn't even want to be friends. 

To wrap up my story (sorry so long), I just needed some advice at how to cope with this entire situation. We both still have a little time here at school and share the same friends, so it's not like I can avoid seeing him. I feel myself slipping into depression already, I have to learn how to be by myself for the first time since being here and that's a little intimidating. I feel like I just need help.