The Reif of the original timeline has absolutely no one to care for and love him. He lived a very painful life that would cause most people to simply yearn for death
Despite not doing anything wrong, the world has pushed him to commit mass murders for the sake of keeping his life
Despite not expecting any love after he blackened, deep inside the original Reif, he was still starved and yearning for love
Thus, it was understandable that he would find it hard to accept that the younger Reif that has everything he could only dream of has this low level of resolve
He would give up in life any moment from now if he was still experiencing that great pain
"I'm disappointed, really disappointed. How could you let down the person that cared and love you greatly?" The older Reif was beyond displeased, he was incensed