why the relation are affected by living together and away

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me a boy of 20 years old and living together with my elder brother and his family i always think that my brother's wife loves me care me but after staying over more than one years together slowly shetry to ignore me and aviod me although i have respect towards her and i care her as i do earlier. i want to stay peacefully but why she feels that i am a burden for her. we meet 5 yrs ago she loved me so much that i could not beleive why she is changing ............now i remember that my mother said to me relation has its value when we are far from each other...............................................///////????