How should i handle my problem?

okay so im sitting at my lunch table with all my friends when my best friend (x-best friend)!! comes up and says that my boyfriend of 8 mounths dosent like me and that its over and he has moved on and found someone eles. and completly shoked i yelled "what with who" and she said "me, and he says im way better than you!!" im soo freaking mad i could kill her! im so embaressed she said that in front of everyone! we were BEST friends!! how could she do that to me,, ughhhhhh! and now i dont have my best friend nor a boyfriend i feel like i have nobody and nothing to live for.. ugh!! maybe i need a consular or just needs too take care of the ***** myself!! what do you think i should do/say?