The Reborn Princess: Prime Minister, Run Quickly

I watched the happy ending first and then read it. I admit that the first dozen chapters were OK, but later on the heroine's aura exploded like a holy mother's halo, and she could forgive those who had harmed her in her previous life again and again. I can't understand it. Then I tuned to the end and found out that the man (Nangong Qing) who harmed the heroine in his previous life is still alive. I don't know why the heroine forgave him. Anyway, I didn't watch it in the middle and I can't watch it anymore. I don't understand why I have to forgive, maybe there is a reason, heroine, just be happy┐(─__─)┌