This is really heartbreaking, and I'm glad we got to this point quickly. But I'm even more glad that he's as attached to her as he is.
Imagine the scenario for yourself... you find a stranger passed out in the middle of nowhere, the only ethical thing to do is give them a temporary place to stay. They fall really sick and you have to rush them to the hospital by any means necessary. Afterward, since you're in the city, it's a good chance to part ways as that person was a drain on your limited resources, and you're back in civilization anyways. Then they tell you they have no family, no place to go, no money, and a terminal illness with only a few months left, and you're their only hope to fufill their dream in life. Like shit bro that's heavy, I've only known you for a few days.
Thank god they're in love.