Please answer this I said please an I really need serious help!?

So yeah this boy that like me said I was going to dump the boy im in love with for hid cousin and I would never do that ever now he is mad at me and not answering my calls and im way to nervous to talk to him he said he dumped me but he never told me and he flirting with other girls and he yelled and said I will never go out with her ugly azz and I don't know what to do (and im a girl) I don't know if its like jealousy and I want him to get back with him because whatever he does I will Always love him!