Not being able to confide in anyone and continuing an unrequited love must surely be causing you much suffering. How can you improve the current situation? You, who are constantly troubled by this question, will surely not want to experience this again. The words may not sound good, but surprisingly, the success rate of this love is quite high.
Your kindness and compassion may captivate that person's eyes, and they might also be thinking about you. However, as this love progresses, you may sever ties with your friends here. Moreover, your friend might be quite shocked and may not be able to recover from it for a long time. Please think carefully about what to do.
As a sign that person is about to break up with a friend, the friend will always invite you to a drinking party and want you to listen to their partner's complaints. All you have to do is listen to those complaints. Within a few months, those two will break up. That is the best chance to approach that person. Try to gradually get closer to their heart. However, even if those two start dating after breaking up, the relationship with your friend will not last long. Your friend will surely be shocked.