I might answer this way. Why do you care? Because I love you.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
chinajonI think "What do you care?" is idiomatic and should not be translated literally as above. It is usually said in anger,I don't think that 'What do you care' is idiomatic, nor is it usually used in arguments