with this has taught me this:

Some people get internal payoffs during the infatuation phase of any relationship. There is an energy or excitement when you click with a new made friend. When this happens, there are increased levels of certain neurotransmitters that reinforce the relationship.

Some people get hooked on this rush feeling. As time passes, then real commitment begins which is usually less exciting and starts to require WORK.
Superficial people get bored when this starts, and move on.
This can be seen very easily in young people. Middle school/high school.
And many outgrow the need for excitement.

But narcissistic people never do. While it is painful to run into these types,
over time it is best when they "leave"...you are spared much future pain, IMO.


http://www.halcyon.com/jmashmun/npd/

This link is written clearly, and easy to understand., it explains narcissistic behavior in everyday
events.

There is another really good book called:
When Friendships Hurt.
http://www.whenfriendshiphurts.com/
This is just excellent, really. And not expensive in paperback.

I am always amazed at what I haven't learned YET...and I am over 60!

I personally think you just avoided a serious painful future. Read these two sources and see if that fits. You shouldn't blame yourself!