I think so. Remember, he was made from "parts", which were changing multiple times until Sarah was satisfied with it(to completely resemble her partner). So I'm assuming that she took a "part" from her dying partner. But the "part" is have a shelf live lol... you know what I mean (⌒▽⌒)
He trhowing up blood while we get to know how Sarah met his dad is giving me this vibe. Is he sick like his dad?