"It is by not always thinking of yourself, if you can manage it, that you might somehow be happy. Until you make room in your life for someone as important to you as yourself, you will always be searching and lost" Richard Bach, Spoken by Leslie Parrish, The Bridge Across Forever
Along this line of thought came Sigmund Freud and said.."Most people do not really want freedom, because freedom involves responsibility, and most people are frightened of responsibility."
However as fine lines go..there is a little space in between thinking about the other person and thinking for the other person. That little space is the only space you need in a relationship to keep your sanity I think. People I have read, and have spoken to argue vociferously for space...sometimes I am not sure if they are talking about the space to disagree or the space to not get involved. Not sure sometimes..