What would happen if he blocked the ex on FB and changed his e-mail/phone number, etc? To me, these actions would be clear signs that he is over her and prioritizing your potential and relationship. Do you agree? If you do, communicate that to him, as you did regarding your own actions wrt his ex, and then leave it to him to act in a positive manner. Continue on with your young life and studies. Big world out there
If I'm reading correctly that he broke up with you, then it's incumbent upon him to decide if that's going to stick or whether he wants to put this ex behind him and rebuild your relationship. Your decision is whether/if you want that and, if so, what are the parameters for that process. I'm sure it's a lot more complicated than his ex, but that issue is a good start.
A good question to ask yourself during this time would be are you still attracted to him and, considering the totality of what you shared, why? This can reveal aspects of yourself which you can learn from, moving forward.
Best wishes and enjoy your last year in college