Self - love is key. The person who had a broken heart started to focus on themselves, taking care of their physical and mental health. They went to the gym, ate well, and practiced meditation. As they grew stronger and more confident, their heart healed.
Naruto himself is the most obvious one. His love interests, like Sakura, could be involved. If Sakura were to reject Naruto's feelings harshly, it would break his heart. Sasuke could also play a role. If Sasuke were to do something that Naruto thought was a betrayal of their friendship, it would cause Naruto great emotional pain.
It's possible that they sought support from their friends and family. They opened up about their feelings, shared their pain, and with the love and care from their loved ones, they were able to start the process of mending their broken heart. Their friends and family provided a shoulder to cry on and also some practical advice on how to move forward.
There was a couple. The man, Jack, fell in love with a woman named Rose. However, Rose's family didn't approve of Jack. They forced Rose to break up with him. Jack was left with a broken heart. He tried to move on but every time he saw something that reminded him of Rose, like the flowers they used to pick together, his heart ached all over again.
I don't think 'Shards' is a true story. It could be a piece of imaginative literature, crafted to entertain or convey certain ideas rather than recounting real events.
One possible reason could be the end of a romantic relationship. Maybe there was a betrayal, like one partner cheating on the other, which shattered the trust and led to a broken heart.
There's 'Eleanor & Park' which is a beautiful yet heart - breaking novel about first love. The two main characters, Eleanor and Park, come from different backgrounds and face various challenges in their relationship. The ending is particularly heart - breaking. Also, 'The Notebook' by Nicholas Sparks is a classic. The love story between Noah and Allie, especially when Allie starts to forget Noah due to her illness, is truly a story that can break your heart.
One common theme is lost love. In many heart - broken novels, characters lose their loved ones either through death, separation or other circumstances.