Yes, he can go back a thousand times, and his fiancée has a thousand ways to die. He can go back to the past, but he can't change the facts that happened, and he can also change the process and the form, but he can't change the result.
Therefore, he travels through time, to the future, to find answers.
What drives everything to happen is the terrible word, "if", which is, in essence, human desire. If Emma hadn't died, the time machine probably wouldn't exist.
The fact that what happened can't be changed, if only if, so Alexander can't save Emma back.
The past cannot be changed, only the future can be changed, so Alexander used the time machine to kill the underground family, save the underground family, and finally live happily with Mara.
In the face of reality, in the face of danger, we cannot escape, we can only resist, even at the cost of our lives. In the life of tragedy and suffering, what we have to do is not to escape, only to change, only to resist, only in this way can happiness come.
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