Quote from : Harry Potter and the Half-Blood Prince Book

Ginny, listen...I can't be involved with you anymore. We've got to stop seeing each other. We can't be together." "It's for some stupid noble reason isn't it?" "It's been like...like something out of someone else's life these last few weeks with you. But I can't...we can't...I've got to do things alone now. Voldemort uses people his enemies are close to. He's already used you as bait once, and that was just because you were my best friend's sister. Think how much danger you'll be in if we keep this up. He'll know, he'll find out. He'll try and get me through you." "What if I don't care?" "I care. How do you think I'd feel if this was your funeral...and it was my fault...