Why familiarity breeds contempt?

The good ol' saying goes- Familiarity breeds contempt...Till date it is considered a myth...of course who wont be happy constantly running into their near and dear ones? theres nothing like chattin or freaking endlessly, of course there are meaningless fights to wile away time ,a comforting word of solace , a reassuring touch during the turbulent times...are priceless gifts to be blessed with from our loved ones....But there is always an undercurrent of a possibility of a contempt when we familiarise beyond a certain limit...be it whoever we know...this is the dark truth......The burden of expectations further deepens the possibility of a cold war between the souls....why is this so? the answer lies here-Never exceed your welcome....this is true everywhere...our prime duty should be to make our folks happy....yes be with them when they are happy and share their grief too...but there are times when we need to respect their need for their personal space......if we know a person well enough we can understand this aspect...in certain situations...though we might expect them to understand our concern towards them...we shouldnt blame them when they make it clear that our intervention isnt needed at that point...this doesnt mean that they dint remember about what all has been done for them....they are only askin for an oppurtunity to help themselves which should be appreciated...here comes the idea of contempt if we impose ourselves on their thought process...we all are humans...though sumone may constantly occupy 99.99 percent of the space.in our heart..we still need that 0.01 percent for ourselves...and that should be respected by our kith and kin....there are times when we need to leave them alone to muse....we arent desertin them...we are helping them to realise their self consciousness to exude their rationality...i would never say just familiarity breeds contempt...its just excess of that which can cause havoc...so ppl lets live and let live...love and let love