Me and my boyfriend are in a point of breaking up and i don't kno what 2 do?? Plz help =(?

so my boyfriend and i got in an argument and he went 2 his cl n he has a girl dat likes him in dat cl n dey talk...he talkd 2 her about our problem n she keeps puttin stuff in his head dat if we argue 2 much n bad stuff happnd we rnt mean 2 b with eachother..n im mad about dat! n now he's thinkin dat 2...i need help n advice..i dnt kno what to do..