Please help me, my girlfriend says she can't marry me becuase i have heart problem. How to convince her..?

plz help me m vry depressed.my gf tld me dat i cnt marry u coz u hv heart problem.she never told me this thing previously.i love her a lot.but she dosent respects me.my friend told me dump hr bt i cnt coz i love hr.m badly confused.m i facing problems coz of my heart problem.plz help me.