unsure of the next move....

My boyfriend and I just recently broke up. We had never had a fight before things where good and then all of the sudden things change. He's not willing to talk to me about it he just wants to be done. I dont know what to do I feel lost. I love him I care so much about him. What do I do? How do I give him breather time and not go crazy. Do I give up or do I fight for what I want?