Probably safe to say Roswell and Sal aren't cannon boyfriends judging from what grizz said about the sequel. If they where then dave would probably guaranteed to pop up but with even a dave cameo being a maybe i think probably not.
I'm making an active effort to leave the hyena with his happy end come the end of Password, regardless of who the intended boyfriend is. So if it is Sal or Roswell, know the story I want to tell with the sequel is a lot less focused on romantic relationships and dealing with the fact the police are kinda garbage in-universe currently.