once a wise man told me

There is no reason for breaking up. The point is the act and intention of breaking up.
When there's no mutual goal for the future, it usually means that's it.
The reason why one keeps going back to the old lover, is because one hasn't found anyone better yet. Once got back together, one finds that the old lover is still not the most suitable one, therefore facing another breakup. The whole routine just keeps continuing until there's no one suitable anymore.

Being friends will always be easier than being together. Therefore we come to a temporary end.

Hello new life.