Can you recommend a novel that makes people feel sad and emotional?

Looking for a sentimental romance novel, the heroine is very simple and beautiful, very likable, the feelings between men and women are very deep but can not be together, the process and ending are very sad, very touching, very heartbroken, the kind that makes people cry, the more touching the better, suitable for 17 - 18 years old boys or those who have lost their love to watch, the school is also fine, the text language is moving and beautiful, do not want childish vulgar,,,,, thank you brother sister brother sister recommended, do not copy, do not want a lot, just a few of the most classic touching thank you thank you