Diagnosis

I am 21 with a beautiful baby girl at home, and just got diagnosed with melanoma... we just lost my father in law 12 days ago to stage 4 melanoma, and i dont want to put my boyfriend and his family through that again.... i dont have insurance, and dont want to put that stress on him and im fighting myself right now, but the only way i see in protecting him is not telling him and breaking us up... because then at least i know he will find someone that will make him happy.. we fight so much, and im sure he can find someone better.... he will be happy and i can deal with this alone... i dont know what else i can do...