In this life, he 1 gave up his 2 for his master, but turned his back on his sect after losing him 2.
In this life, he 2 lost his life because he fell in love with him 1. He 2 didn't hate him 1, he just regretted it.
There is no next life for them. This life is over, and there will never be another one.
Do you regret it? Never, willingly.