I feel like I cant go on without him, please help?

My bf split up with me for the second time about 2 months ago for no specific reason just he said he doesn't feel like he could hold down a relationship, and at first i wasn't to upset (now i realised that was because we got back together before it might happen again, but it didn't) The only time im not desperately unhappy is when im asleep, ive got the worst feeling in my stomach 24/7 and i have no appetite. I had a go at him friday because i was so angry the way hes made me feel and i probably went to far, I have tried to apologise but he wont listen. Now ive looked on his facebook and a girl has wrote something ually suggestive about Saturday night and I feel so numb the pain is so bad. I don't no what to do, people ar saying threes more guys out there but hes the only one i see in my head, i cant bring myself to even talk to anyone else