letting go

It is weird the way someone can have such an impact on your life, then no longer be in your life. It is even weirder when that person comes back and you don't even care. This makes me a little bit sad.
The hardest thing I've had to accept is that some relationships are not meant to last forever. They are only meant for a specific time. Then you must let go. I'm not good at the letting go. Especially if I still care.