What happens if my boyfriend breaks up with me ???!?

i have been going out with him for exactly 3 years and i looooove him and his friend sorta gave me the hint that he might break up with me .... i dunno m i going to be heart broken forever ... i cryed myself to sleep last night bec asue i couldnt stop thinking about it ... have this happpend to you .??? and if so what did you do ???