It has become fashionable in therapy circles to hold two beliefs: (a) You can't change another person, only yourself; and (b) you shouldn't change yourself for a relationship or for another person... [But] we change each other all the time. People change for those they love quite often... The relationships that call forth positive change are those that provide a ground of accepting the person... Relationships can illuminate flaws in one's approach to life by exposing one to other ways of thinking and doing things... [Through relationships] we can learn to recognize and change deeply unconscious patterns.
Source: Change 101: A Practical Guide to Creating Change in Life or Therapy
Contributed by: Mary_C