That is what he means. If he can't keep her, he doesn't care about the rest of the universe. He'll take whatever they can manage to have until...

It may help to know that the origin of the character was from a previous prompt about a "groundhog day" superhero. I'll copy in the story as a separate response here.

But, originally, he led a fairly linear life. The backward skips were bad, but he didn't lose much. He gained because he could undo the bad.

But then he went waaaay back. And he's been bouncing back and forth through the same span of time ever since.

He had gotten inured to death. He accepted that he was just gloomy to keep going, seeing the death, but apart from it because the only thing that mattered was fixing those deaths.

And then he met her. And his entire universe shifted. He's seen her die. At least once, likely more. That's breaking him. That's shifting his goal from saving the world to just not losing her.

Which is probably a bit spoilerish, but the whole thing is burning in my brain currently, so it needs out