the quality or state of being aloof, distant, or reserved; indifference: His girlfriend's recent aloofness may be a sign that the relationship is over.

What is the true definition of aloofness?

: removed or distant either physically or emotionally an aloof, unfriendly manner He stood aloof from worldly success.—

What does the word aloofness mean in the above lines *?

adjective. reserved or reticent; indifferent; disinterested: Because of his shyness, he had the reputation of being aloof.