"It's not about 'could I live without you?' but it's about 'could I be happy without you?'"

can you see the differences from the sentence above? yes, it's not about could i live without him or not, really. i'm sure that i can still breathe, i'm still alive and i'm still me. but it must be a hardly breathing, i'm half alive and i'm not the old me. the point is i'm not as happy as when he's here. it feels like something disappear from my life, that could change my life too. sorry, i'm not 'lebay' or something, but that is what i feel exactly.