He frankly told Danny in Season 6 that he had to keep his distance because he has a contagious and nearly incurable disease. She told him to find a cure (maybe paying his expenses) and hurry back. Which is exactly what he's doing.

@CharlesTheBold said:

He frankly told Danny in Season 6 that he had to keep his distance because he has a contagious and nearly incurable disease. She told him to find a cure (maybe paying his expenses) and hurry back. Which is exactly what he's doing.

I know this.^.It just felt this way to me.