You see, a better ending would be that he didn't survive the vent. The whole situation was already implausible, and him surviving somehow makes it completely unbelievable. If they'd let him die, the theoretical question of "what would you do in his position" becomes super real for her. As mad as she was that he woke her up, that he "murdered her," would she be able to tolerate never again speaking to another person?
Instead it cheaply rushes through her "I can't be here alone!" moment; she saves him; he can put her back to sleep; but no! she wants to be with him. She chooses him, after spending a few minutes contemplating life alone and conveniently being able to go back to sleep if she wants.
It's better if there are tons of med pods (as there would be); he dies (as he really needed to); and it ends with her picking up some tools or with an empty shot and the sounds of another pod saying "hello" to somebody else.