Ex-Boyfriend's Temperament Changed Drastically After Reunion

[Two male protagonists + 1v1 + reunion + double cleansing + sourness + he] Hard-spoken, soft-hearted but aggressive × Strong, depressed and suffering Young Master Gu used to be arrogant and showy, but also very naive. Naive enough to think that love can really last forever. It wasn't until Xu Yi's words of separation came after four years of dating. — "Ayi, can you not break up?" Gu Xingchuan's eyes were red, and his proud back was humbled to the extreme for his lover. Xu Yi sneered: "It's just a joke, but you still take it seriously." — When we met again, another three years had passed. Gu Xingchuan is no longer an arrogant young master, but is ruthless and unscrupulous. Time flies and the story restarts. At the banquet, Gu Xingchuan admitted amidst all the teasing: "Yes, I'm getting engaged, just next month." Xu Yi's heart trembled, and he hid his trembling fingers and wished him: "Happy engagement." — People have joys and sorrows, and the moon waxes and wanes. When will the broken mirror be reunited?