Jason's sweethearts (or basically any person he sleeps with) die not because of 'bad luck, ' but because of Adrian: Jason develops a personality disorder; there's Jason and there's Adrian inside of one body, and his roommate 'Adrian' is actually Spider (full name: Bluestar Spider), a perilous wanted hacker.

That was confusing, I know. There are two Adrians: one is Jason's other personality; the other's his rommate, whose real name is not revealed, but is known as Bluestar Spider. They just share the name because.

Spider is deeply in love with Jason (although he states he's actually okay with either of his personalities because both are Jason and he loves him that way) and murders every possible love interest of his using his superb hacking skills. Sometimes he needs a little help, though, so Adrian!Jason comes out and helps him carrying out the bloody while Jason 'sleeps.'

You'll notice how Adrian constantly tells Jason 'to sleep' and 'wake up to a new day.'

Anyway, that yandere-like thing of Adrian eventually escalates, obviously, and the FBI end up getting their eyes on Jason, who's always the one in the wrong place at the wrong time. Hence, when he's wanted for murder, Spider goes out of his way to clean up the mess he himself created (in which Jason is pretty much innocent and a victim) and eventually manages to brush the federal agent away.

By the end of the novel, apparently just Jason exists (temporarily or forever? Who knows) and Adrian 'sleeps.'

Likewise, by the end Jason seems to be aware about this personality disorder (it isn't textually stated, though. He probably found out along the way) and later he even suggests getting a different nickname for each of them (his second personality and Bluestar Spider), but at the end he just calls both of them 'Adrian/Adri.'

And, to everyone's sadness, you get to read Jason doing the nasty with literally everyone but ML. That, or I read some censured raws, which is highly unlikely as those were traditional, illegal, and actually R18.