Outside of family, there are colleagues, acquaintances, well wishers and friends, all of which are present in a spectrum too, with the division between each sometimes clearly visible, and many times not.
If one does not know how to discern who falls in to each category or does not maintain those boundaries, they will be met with disappointments and betrayals.
Understand the nuances, set or recognize boundaries, decide on the level of investment in terms of time and effort in building relationships accordingly.