I am heatboken.. needs seious advice..?

plz help me m vry depressed.my gf tld me dat i cnt marry u coz u hv heart problem.she nvr tld me ds thng previously.i love hr lot.bt she dosent respects me.my frnd tld me dump hr bt i cnt coz i love hr.m badly confused. i m facing problems coz of my heart problem. please help me..