That doesn't sound like it's coming from a heartless person at all. Heartless people don't need happiness, control, or love.
Ohhh... unless you mean you don't have someone ELSE'S heart... then that changes everything. But I still like it, no matter what you're going for.
I love when poems are short, but manage to say a lot... and yours definitely did.
Grammar wise: through instead of threw, spostrophe in I'm and none in cares or ways. somebody should be one word. Perhaps put a semicolon after heartless. Overwhelmed should also be one word. explicit. somewhere. This writing isn't bad... however it is just really random. First it seems that there is noone. Then "I need you, you need me" makes me think that there is someone. Then it goes back to the cry for love. I like the crying out thing. I used to feel that way all the time... I just didn't have a way to say it. But that last line "I loved You" just hanging there... that's the most powerful line in the writing.