History should be able to tell us where we came from and how we arrived here, in these situations, and with our present understandings. If history did all that, then we would be well prepared to make policies and judgements, and to move forward as a community.
Good history provides a good basis for political economy, for sociology, social psychology, anthropology, archeology and law. All such studies require a clear understanding of trends in human experience; of the way the species handled its decisions and especially its mistakes, and the future of its aspirations, hopes, doubts and fears.
Unfortunately, history is not a science. It depends on the perceptions and interpretations of human beings, some of whom may have points to prove or prejudices to support, or perhaps just hold mistaken views of life. What actually happened in the past is not known for certain. Even the people who were there and recorded their observations were mere human beings; not cameras or video machines. All we have to go on are accounts from other people and many of them will conflict with each other.
So, history is the basis for understanding the human condition but it is not 100 per cent reliable and cannot provide a scientific or even a perfectly logical base for other social studies. In this sense, history is a disappointment and historians among the least convincing academics over many issues and events from the past.
But history is all we have and the proper search is for good, reasonable, and understandable interpretations of what people say happened and of the physical evidence that can be amassed from investigations.
Hope your broken heart gets fixed.