What's personal? Anything?

While reading "The Four Agreements: Chapter 3: Don't Take Anything Personally" it was hard for me to reconcile a broken heart with the words I was reading.
So if it's not personal that someone choses someone else over you - then I guess it must have something to do with the person who is choosing?
Perhaps your heart isn't being broken, but you are sad for the lost potential - when you have the choice to be happy that something happened and positive about what the future holds because you are confident and wonderful within yourself.
In my case, it's not as much as a broken heart, but a sadness that another will receive the treatment and attention that I yearned for and know I deserve and was trying to give. Thus it's time or overdue to reach out to find what I'm looking for elsewhere - that I shouldn't be upset that another person recognizes they are unable to be in the sort of relationship/connection that I'm looking for (maybe they are even sad about that) - but I should be happy that they recognized it and were able to move the energy forward towards us both finding healthier and more positive connections.

What about rejection? Is that personal? Hard to see how it couldn't be. Yet, I do firmly believe that nothing is personal. So then perhaps it is the other person's lack of recognition of how great you are - or their recognition of the fact that you wouldn't relate as well as you think - or it's timing - or it's their realization that for them, the situation isn't as ideal or wonderful as you think it is for you. That you may get a lot from it, but they aren't experiencing the same.

Another aspect is that you might think you are feeling rejection - when it might have nothing to do with the situation - but with past associations, or perhaps you're feeling afraid, you're feeling lost, maybe you don't even want to be with that person - you just want to be with someone. Maybe you're worried that despite there being 6 billion people out there, that you won't find another person to relate to.

In the end, I firmly do believe what I read, that nothing is personal. And when anything feels personal, I will be confident that I will be able to look at it from a new perspective or light that will enable me to understand how I am wrong - and how I can take the negativity created - and transform it into positivity.