Should i just leave him?

i caught my bf cheating on me and myspace. he took me off his top friends and placed that ugly h0e on his. well i read some of da pic comments he wrote and it said damn you hella sexy baby or i love you baby and damn you fine baby. this hurt my feelings so much. The girl is waay ugly i couldnt imagine him being together. He was stupid enough to give his new cell phone number through comments, but when i ask him what his new cell number he just read my message. She wrote in her blog that me and my baby back together i was outrage he said i cant even believe we broke up in the first place baby. Im so pissed off i hate him but love him at the same time. He even had the nerve enough to want me to call him tonight. What should i say should i cuss him out or what im so mad at him? he dont know that i know hes cheating on me.