After the breakup, I became my ex-girlfriend's white moonlight

[Pure love, abuse, confession] [Childhood sweetheart, parents, ex-girlfriend]
[Not a happy story, the protagonist used to have a hard life, but now he is living a life of luxury]
When he was a teenager, at the age of first falling in love, Jiang Huai had a crush on his childhood sweetheart Jiang Yunyao. But that year, a transfer student came to the class, and her childhood sweetheart wiped out Jiang Huai's kindness to her for the sake of the transfer student.
In college, Jiang Huai had his first love Lin Jia, and the two were in a long-distance relationship for seven years. However, the moment Lin Jia returned to China, her love for Jiang Huai disappeared like a bubble.
When Jiang Huai was diagnosed with cancer, Qingmei and first love both regretted their decision, and Jiang Huai became their white moonlight instead.
From childhood to adulthood, Jiang Huai has never been firmly chosen by anyone, and his parents have never given him warmth, always favoring his younger brother in everything.
Jiang Huai swore that if he had the chance to start over, he would no longer want to have any weaknesses.
The introduction is weak, please go to the main text