I believe the author mentioned that this is "Stories" and Julian's story is just the first one, so hopefully there will be others around the current or new characters in the future.
As for Chuck, he and Dozer are not likely to separate but I would not be surprised if they would "play/work overtime" with Julian should he ever show an interest (and Chuck is the type to pick up very quickly if someone is interested).
As for possible love connections for Julian, we currently have a limited set of available guys.
- Sam
- Gabriel
- Alan
- Kurt
- Jack
- Sarge (but I think he's more of just a crush)
- Angelo? (The guy who owns the pizza place)