I broke up with my boyfriend.. What should I do?

I broke up with my boyfriend.. & this pain I'm feeling is really unbearable.. We were going good until a week ago, he told me that he needed to break up with me. It's killing me b/c he gave very unclear and ambiguous reasons as to why he wanted to leave me. But I'm feeling more so hurt b/c this was so unforeseen and too sudden. I've been crying so much and for so long.. I really do still love him very much. As time pes by, this emptiness that I feel inside my heart seems to be growing bigger. I thought I would feel atleast a bit better after a few days, but I feel worse. I have lost any & all motivation to do anything. & I really don't know what I should do...