Loyalty is a weird thing. It is a very admirable trait to have, however, when in a world that selling out is the norm, it is very dangerous.

When you are loyal to someone, and they are loyal to you, then it become a great synergistic bond, where the two of you can do more than either alone.
This is great! This is the best!

The biggest problem with being a loyal type person is that you see everything through "you" colored glasses. You assume other people have some loyalty. You believe the scale goes from:
. . . . . . . . . . . . . . . . . . No loyalty <---------|----------> High loyalty

You believe that a company you are working for, or a company you are buying from actually cares (at least a little bit) for you.

When in actuality the scale goes from:
Neg loyalty <----------------No loyalty -----------------> High loyalty

There are people actually out to screw you over. And want nothing more then for you to put your trust and loyalty in you.

In most jobs, you will find people that really want to use you. But, for the most part, you will find people that really do not care. They have no loyalty at all. The job is a job. You are a coworker in passing.

So, be aware that you are seeing the world through tinted glasses and make adjustments. I strongly suggest learning how much you can give, and never giving more than that. At this level, you can sustain your giving, and even if the other person turns out to be evil (or just untrustworthy) then you will not fall apart.