Things, at times, are so much simpler than we make them.

Sometimes, he doesn't love you.
Sometimes, we cry.
Sometimes, he won't stay.

Sometimes, he does love you.
Sometimes, it was just a good day.
Sometimes, he is going to stay.

We can't explain everything.  We lose what we want and stumble upon better.
We question and wonder, but this doesn't mean that you have some complex disorder that will change your life.   You don't need anything more than to know that things just happen.