Even though you don't care...it is still disappointing. If you have this attitude does this mean you still care...a bit?

Putting it in context: So..my BF or GF found another...I don't care but yes...it does upset me just a bit. Amirite paid no attention to my comment...I don't give a damn...yet I am still just a bit disappointed. What does that mean? Or is it just part of being a human?