When people know you're trustworthy,
they have a tendency, to take advantage
of you. This of course, isn't fair. They find
an excuse, to get out of their obligations.
Then you end up doing, more then your
share. Which brings me to the issue at
hand. You have to assert yourself at the
very beginning. If you don't, then you'll
always be at their command. What it
actually boils down to is, if you're not
happy, you have only yourself to blame.
Once you take a stand and your feelings
are known, you can be assured, it's
another ball game!

Audrey Heller

http://www.poemhunter.com/poem/taking-advantage/