A summary of my experience.
I have been heartbroken before, and the experience taught me that it's mean and that I shouldn’t let someone go through the same thing. It has also opened my eyes on the realities of immature love. Something mature at least may lead to marriage. I would never date someone conceived to be immature in thoughts and ambitions. My thoughts on how a man should treat a woman and vice versa are that there should be basic support (both financial and moral) whenever need arises. For long-distance relationships, communication sustains and increases intimacy in love.
Surprises play a huge role. Petty or little things may mean quite a lot. Once in a while, those in a relationship should give to each other if they can build a strong bond.