There is no formula to relationships. They have to be negotiated in loving ways, with room for both parties, what they want and what they need, what they can do and what their life is like. ...Love is where you are as concerned about someone else's situation as you are about your own.
- Morrie Schwartz, Tuesdays with Morrie by Mitch Albom
Everyone should read this book. Seriously. And the earlier on in their lives the better.